Accounts Notes And Loans Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts Notes Loans And Financing Receivable By Receivable Type [Axis] Receivable Type [Axis] Accounts Payable And Accrued Liabilities Current Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities [Member] Accounts Payable And Accrued Liabilities [Member] Accounts Payable and Accrued Liabilities Accounts Receivable Net Current Accounts receivable Accrued Interest on Note Receivable Accrued Interest On Note Receivable Promissory note receivable, accrued interest Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Property and equipment, accumulated depreciation Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated other comprehensive loss Acquired Finite Lived Intangible Assets Weighted Average Useful Life Weighted average useful lives of acquired intangibles Acquired Intangible Assets by Major Class [Axis] Acquired Intangible Assets By Major Class [Axis] Acquired Intangible Assets by Major Class [Axis] Acquired Intangible Assets, Major Class Name [Domain] Acquired Intangible Assets Major Class Name [Domain] Acquired Intangible Assets, Major Class Name [Domain] Additional Colorado Gaming Regulations [Member] Additional Colorado Gaming Regulations [Member] Additional Colorado Gaming Regulations Additional Paid In Capital Common Stock Additional paid-in capital Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Allowance For Doubtful Accounts Premiums And Other Receivables BVD/BVO Receivable, valuation allowance for the total principal and interest due Amendment Flag Amendment Flag Amortization Of Financing Costs Amortization of deferred loan issuance costs Amortization of loan issue costs Amortization Of Intangible Assets Current year amortization Annual License Fees Annual License Fees Annual fee for each licensed gaming device located in a licensed location Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Potential dilutive common shares issuable under options not included in the calculation of diluted earnings per share Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Applicable Margin Rate On Base Rate Applicable Margin Rate On Base Rate Interest rate spread above prime rate Applicable Margin Rate On LIBOR Rate Applicable Margin Rate On London Interbank Offered Rate Rate Note payable, interest rate spread above LIBOR Asset Impairment Charges Impairment of vacant land asset Asset Impairment Charges [Text Block] Impairment of Assets Assets Total assets Total assets Assets [Abstract] ASSETS Assets Current Total current assets Assets Current [Abstract] Current assets: Assets Held For Sale Current Assets of operations held for sale Inventory Assets Held For Sale Long Lived Fair Value Disclosure Aggregate estimate fair value of impaired land Assets Held For Sale [Member] Assets of Operations Held for Sale Assets Held For Sale Property Plant And Equipment Real estate held for sale Assets Of Disposal Group Including Discontinued Operation Assets of operations held for sale Assets Of Disposal Group Including Discontinued Operation Noncurrent Assets of operations held for sale Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Big City Capital, Limited Liability Company [Member] Big City Capital Limited Liability Company [Member] Big City Capital, LLC Bothell Lease [Member] Bothell Lease [Member] Bothell Lease Business Acquisition Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition Cost Of Acquired Entity Cash Paid Business acquisition, cash paid Business Acquisition Cost Of Acquired Entity Equity Interests Issued And Issuable Business acquisition, common stock issued Business Acquisition Cost Of Acquired Entity Purchase Price Business acquisition, purchase price Purchase price Stock Purchase Agreement to purchase all of the shares of South Dakota Gold Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Purchase Price Allocation, Current Assets and Liabilities, Net Business Acquisition Purchase Price Allocation Current Assets And Liabilities Net Current assets and liabilities, net Business Acquisition Purchase Price Allocation Goodwill Amount Goodwill Business Acquisition, Purchase Price Allocation, Intangible Assets, Non Compete Agreement Business Acquisition Purchase Price Allocation Intangible Assets Non Compete Agreement Non-compete Business Acquisition, Purchase Price Allocation, Intangible Assets, Primarily Customer Relationship Business Acquisition Purchase Price Allocation Intangible Assets Primarily Customer Relationship Customer relationships Business Acquisition Purchase Price Allocation Property Plant And Equipment Property and equipment Business Combination Acquisition Related Costs Acquisition costs Business acquisition related expenses Business Combination, Closing Costs and Pre-Opening Expenses Business Combination Closing Costs And Pre Opening Expenses Business acquisition, closing and pre-opening expenses Business Combination Disclosure [Text Block] Acquisitions B V Oro, Limited Liability Company [Member] B V Oro Limited Liability Company [Member] B. V. Oro, LLC Carried Interest in Ownership Interest Sold Carried Interest In Ownership Interest Sold Carried interest in the membership interest sold to BVO Cash And Cash Equivalents At Carrying Value Cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Net increase (decrease) in cash and cash equivalents Cash and Restricted Cash at Carrying Value Cash And Restricted Cash At Carrying Value Cash and restricted cash not allocated to segments Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Non-cash investing and financing activities: Casino Expenses Casino Casino Revenue Casino Changes in Goodwill and Other Intangible Assets table [Text Block] Changes In Goodwill And Other Intangible Assets Table [Text Block] Change in Carrying Amount of Goodwill and Other Intangibles Class Of Warrant Or Right Common Stock Exchange Ratio Class Of Warrant Or Right Common Stock Exchange Ratio Sale of common stock shares, number of common stock exchange for each warrant Class Of Warrant Or Right Exercise Price Of Warrants Or Rights Sale of common stock shares, warrant issued exercise price Class of Warrant Term Class Of Warrant Term Sale of common stock shares, warrant issued exercisable period from initial exercise date Colorado Constitution [Member] Colorado Constitution [Member] Colorado Constitution Colorado Gaming Law [Member] Colorado Gaming Law [Member] Colorado Gaming Law Colorado Grande Casino [Member] Colorado Grande Casino [Member] Colorado Grande Casino Colorado Limited Gaming Act [Member] Colorado Limited Gaming Act [Member] Colorado Limited Gaming Act Commitment by Nature [Axis] Commitment By Nature [Axis] Commitment by Nature [Axis] Commitment by Nature [Domain] Commitment By Nature [Domain] Commitment by Nature [Domain] Commitments and Contingencies Disclosure [Line Items] Commitments And Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Table] Commitments And Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Commitments And Contingencies Disclosure [Text Block] Commitments and Contingencies Common Stock Issuance [Text Block] Common Stock Issuance [Text Block] Stock Offering Common Stock Par Or Stated Value Per Share Common stock, par value Common Stock Shares Authorized Common stock, shares authorized Common Stock Shares Issued Common stock, shares issued Common Stock Shares Outstanding Common stock, shares outstanding Common Stock Value Common stock, $0.12 par value per share; 50,000,000 shares authorized; 16,743,011 and 16,707,205 shares issued and 15,960,174 and 15,924,368 shares outstanding at July 31, 2012, and April 30, 2012, respectively Construction In Progress Gross Investments in development projects This element consists primarily of general corporate overhead and corporate service department costs, primarily in the areas of technical services, human resources and finance, which are used by the operations. It also includes business development costs. Corporate Expenditure Corporate expense Cost Of Services Total cost of complimentary services Cost Of Services Catering Food and beverage Costs And Expenses Total operating expenses Costs And Expenses [Abstract] Expenses: Current Fiscal Year End Date Current Fiscal Year End Date Customer Relationships [Member] Customer Relationships Debt Disclosure [Line Items] Debt Disclosure [Line Items] Debt Disclosure [Line Items] Debt Disclosure [Table] Debt Disclosure [Table] Debt Disclosure [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument Basis Spread On Variable Rate Note payable, base interest rate Debt Instrument Date Of First Required Payment 1 Note payable, initial repayment date Debt Instrument Face Amount Notes Payable Debt Instrument, Final Payment Amount Debt Instrument Final Payment Amount Note Payable, final payment Debt Instrument, First Installment Date Debt Instrument First Installment Date Note payable, installment beginning date Note Payable, installment payment Debt Instrument, Imputed Interest Rate Debt Instrument Imputed Interest Rate Note payable, imputed interest rate Debt Instrument Interest Rate Stated Percentage Note payable, stated interest rate Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instrument Maturity Date Debt Instrument Maturity Date Note payable, maturity date Debt Instrument, Monthly Payment Debt Instrument Monthly Payment Note payable, monthly installment Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Debt Instrument Periodic Payment Note payable, quarterly payment Debt Instrument Periodic Payment Principal Note Payable, installment payment Debt Instrument [Table] Schedule of Long-term Debt Instruments [Table] Debt Interest Rate [Axis] Debt Interest Rate [Axis] Debt Interest Rate [Axis] Debt Interest Rate [Domain] Debt Interest Rate [Domain] Debt Interest Rate [Domain] Debt Outstanding, Type [Axis] Debt Outstanding Type [Axis] Debt Outstanding, Type [Axis] Debt Outstanding, Type [Domain] Debt Outstanding Type [Domain] Debt Outstanding, Type [Domain] Deferred Compensation Arrangement With Individual Common Stock Reserved For Future Issuance Number of shares of reserved for issuance under stock plan Deferred Compensation Arrangement with Individual, Contributions by Plan Participants, Percentage of Salary, Maximum Deferred Compensation Arrangement With Individual Contributions By Plan Participants Percentage Of Salary Maximum Maximum contributions by participants as percentage of paid compensation Deferred Debt Issuance Costs Deferred Debt Issuance Costs Deferred loan issue costs Deferred loan issue costs incurred Deferred Finance Costs Noncurrent Net Deferred loan issue cost, net Deferred Income Tax Expense Benefit Deferred income tax expense (benefit) Deferred Rent Liability Deferred Rent Liability Deferred rent Deferred Tax Assets Net Noncurrent Deferred tax asset Deferred tax asset, net Deposit Assets Revolving fund deposit for expenses of investigation Depreciation And Amortization Depreciation and amortization Depreciation Depletion And Amortization Depreciation and amortization Disclosure - Acquisitions - Additional Information [Abstract] Disclosure Acquisitions Additional Information [Abstract] Disclosure - Acquisitions - Additional Information [Abstract] Disclosure - Change in Carrying Amount of Goodwill and Other Intangibles [Abstract] Disclosure Change In Carrying Amount Of Goodwill And Other Intangibles [Abstract] Disclosure - Change in Carrying Amount of Goodwill and Other Intangibles [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Disclosure Commitments And Contingencies Additional Information [Abstract] Disclosure - Computation of Earnings Per Share - Additional Information [Abstract] Disclosure Computation Of Earnings Per Share Additional Information [Abstract] Disclosure - Computation of Earnings Per Share - Additional Information [Abstract] Disclosure - Critical Accounting Policies - Additional Information [Abstract] Disclosure Critical Accounting Policies Additional Information [Abstract] Disclosure - Critical Accounting Policies - Additional Information [Abstract] Disclosure - Estimated Cost of Complimentary Services [Abstract] Disclosure Estimated Cost Of Complimentary Services [Abstract] Disclosure - Estimated Cost of Complimentary Services [Abstract] Disclosure - Estimated Future Annual Amortization of Intangible Assets [Abstract] Disclosure Estimated Future Annual Amortization Of Intangible Assets [Abstract] Disclosure - Estimated Future Annual Amortization of Intangible Assets [Abstract] Disclosure - Expected Remaining Future Rolling Twelve Months Minimum Lease Payments [Abstract] Disclosure Expected Remaining Future Rolling Twelve Months Minimum Lease Payments [Abstract] Disclosure - Expected Remaining Future Rolling Twelve Months Minimum Lease Payments [Abstract] Disclosure - Goodwill and Other Intangible Assets - Additional Information [Abstract] Disclosure Goodwill And Other Intangible Assets Additional Information [Abstract] Disclosure - Goodwill and Other Intangible Assets - Additional Information [Abstract] Disclosure - Impairment of Assets - Additional Information [Abstract] Disclosure Impairment Of Assets Additional Information [Abstract] Disclosure - Impairment of Assets - Additional Information [Abstract] Disclosure - Long-Term Debt - Additional Information [Abstract] Disclosure Long Term Debt Additional Information [Abstract] Disclosure - Long-Term Debt - Additional Information [Abstract] Disclosure - Long-Term Financing Obligations [Abstract] Disclosure Long Term Financing Obligations [Abstract] Disclosure - Long-Term Financing Obligations [Abstract] Disclosure - Notes Receivable and BVD BVO Receivable - Additional Information [Abstract] Disclosure Notes Receivable And B V D B V O Receivable Additional Information [Abstract] Disclosure - Notes Receivable and BVD BVO Receivable - Additional Information [Abstract] Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Stock-Based Compensation Disclosure - Other Assets [Abstract] Disclosure Other Assets [Abstract] Disclosure - Other Assets [Abstract] Disclosure - Other Assets - Additional Information [Abstract] Disclosure Other Assets Additional Information [Abstract] Disclosure - Other Assets - Additional Information [Abstract] Disclosure - Preliminary Summary of Remaining Purchase Price Allocation for South Dakota Gold [Abstract] Disclosure Preliminary Summary Of Remaining Purchase Price Allocation For South Dakota Gold [Abstract] Disclosure - Preliminary Summary of Remaining Purchase Price Allocation for South Dakota Gold [Abstract] Disclosure - Preliminary Summary of Remaining Purchase Price Allocation for Washington III [Abstract] Disclosure Preliminary Summary Of Remaining Purchase Price Allocation For Washington I I I [Abstract] Disclosure - Preliminary Summary of Remaining Purchase Price Allocation for Washington III [Abstract] Disclosure - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Computations [Abstract] Disclosure Reconciliation Of Numerators And Denominators Of Basic And Diluted Earnings Per Share Computations [Abstract] Disclosure - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Computations [Abstract] Disclosure - Reconciliation of Reportable Segment Assets to Consolidated Totals [Abstract] Disclosure Reconciliation Of Reportable Segment Assets To Consolidated Totals [Abstract] Disclosure - Reconciliation of Reportable Segment Assets to Consolidated Totals [Abstract] Disclosure - Restricted Cash - Additional Information [Abstract] Disclosure Restricted Cash Additional Information [Abstract] Disclosure - Restricted Cash - Additional Information [Abstract] Disclosure - Sale of Assets Discontinued Operations - Additional Information [Abstract] Disclosure Sale Of Assets Discontinued Operations Additional Information [Abstract] Disclosure - Sale of Assets Discontinued Operations - Additional Information [Abstract] Disclosure - Segment Reporting - Additional Information [Abstract] Disclosure Segment Reporting Additional Information [Abstract] Disclosure - Segment Reporting - Additional Information [Abstract] Disclosure - State Gaming Laws - Additional Information [Abstract] Disclosure State Gaming Laws Additional Information [Abstract] Disclosure - State Gaming Laws - Additional Information [Abstract] Disclosure - Stock-Based Compensation - Additional Information [Abstract] Disclosure Stock Based Compensation Additional Information [Abstract] Disclosure - Stock-Based Compensation - Additional Information [Abstract] Disclosure - Stock Offering - Additional Information [Abstract] Disclosure Stock Offering Additional Information [Abstract] Disclosure - Stock Offering - Additional Information [Abstract] Disclosure - Summarized Financial Information for Reportable Segments [Abstract] Disclosure Summarized Financial Information For Reportable Segments [Abstract] Disclosure - Summarized Financial Information for Reportable Segments [Abstract] Disclosure - Summary of Activity under Share-Based Payment Plans [Abstract] Disclosure Summary Of Activity Under Share Based Payment Plans [Abstract] Disclosure - Summary of Activity under Share-Based Payment Plans [Abstract] Disclosure - Summary of Amortization of Other Intangible Assets [Abstract] Disclosure Summary Of Amortization Of Other Intangible Assets [Abstract] Disclosure - Summary of Amortization of Other Intangible Assets [Abstract] Disclosure - Summary of Assets and Liabilities Held for Sale [Abstract] Disclosure Summary Of Assets And Liabilities Held For Sale [Abstract] Disclosure - Summary of Assets and Liabilities Held for Sale [Abstract] Disclosure - Weighted-Average Assumptions Used to Measure Compensation Cost for Stock Options [Abstract] Disclosure Weighted Average Assumptions Used To Measure Compensation Cost For Stock Options [Abstract] Disclosure - Weighted-Average Assumptions Used to Measure Compensation Cost for Stock Options [Abstract] Disposal Groups Including Discontinued Operations Disclosure [Text Block] Sale of Assets/Discontinued Operations Divestiture [Member] Divestiture [Member] Colorado Grande Casino Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Information [Line Items] Document Information [Line Items] Document Period End Date Document Period End Date Document Type Document Type Earnings Per Share Basic And Diluted [Abstract] Income per share from continuing operations: Per share information: Earnings Per Share Basic And Diluted Denominator [Abstract] Earnings Per Share Basic And Diluted Denominator [Abstract] Denominator: Earnings Per Share Basic And Diluted Numerator [Abstract] Earnings Per Share Basic And Diluted Numerator [Abstract] Numerator: Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Earnings Per Share [Text Block] Computation of Earnings Per Share Employee Stock Purchase Plan Number of Participating Employees Employee Stock Purchase Plan Number Of Participating Employees Number of participants Employee Stock Purchase Plan, 2010 [Member] Employee Stock Purchase Plan Twenty Ten [Member] 2010 Plan Entities [Table] Entities [Table] Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity [Domain] Entity [Domain] Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Equity Incentive Plan Twenty Zero Nine [Member] Equity Incentive Plan Twenty Zero Nine [Member] 2009 Plan Equity Method Investment Ownership Percentage Ownership interest in Buena Vista Development Company, LLC ("BVD") Everett Lease [Member] Everett Lease [Member] Everett Lease Excise And Sales Taxes Excise taxes Expected Amortization Expense [Line Items] Expected Amortization Expense [Line Items] Expected Amortization Expense [Line Items] Expected Amortization Expense [Table] Expected Amortization Expense [Table] Expected Amortization Expense [Table] Facility Membership And Operations Costs Facility Fair Value Of Financial Instruments Policy Fair Value of Financial Instruments and Concentrations of Credit Risk Federal Reserve [Member] Federal Reserve [Member] Federal Reserve Finite Lived Intangible Assets Accumulated Amortization Identifiable intangible assets, accumulated amortization Accumulated Amortization Finite Lived Intangible Assets Amortization Expense After Year Five Thereafter Finite Lived Intangible Assets Amortization Expense Next Twelve Months 2013 Finite Lived Intangible Assets Amortization Expense Year Five 2017 Finite Lived Intangible Assets Amortization Expense Year Four 2016 Finite Lived Intangible Assets Amortization Expense Year Three 2015 Finite Lived Intangible Assets Amortization Expense Year Two 2014 Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Gross Gross Carrying Amount Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite Lived Intangible Assets Net Total Finite Lived Intangible Asset Useful Life Weighted average useful life of amortizable intangible assets First Installment [Member] First Installment [Member] First Installment Food And Beverage Cost Of Sales Food and beverage Food And Beverage Revenue Food and beverage Fourth Installment [Member] Fourth Installment [Member] Fourth Installment