CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Apr. 26, 2015	Apr. 27, 2014	Apr. 28, 2013
Revenues:
Casino	$ 1,054,926us-gaap_CasinoRevenue	$ 1,004,255us-gaap_CasinoRevenue	$ 967,142us-gaap_CasinoRevenue
Rooms	31,565us-gaap_OccupancyRevenue	32,449us-gaap_OccupancyRevenue	31,851us-gaap_OccupancyRevenue
Food, beverage, pari-mutuel and other	139,816	135,305	128,319
Gross revenues	1,226,307	1,172,009	1,127,312
Less promotional allowances	(230,029)us-gaap_PromotionalAllowances	(217,409)us-gaap_PromotionalAllowances	(203,907)us-gaap_PromotionalAllowances
Net revenues	996,278us-gaap_Revenues	954,600us-gaap_Revenues	923,405us-gaap_Revenues
Operating expenses:
Casino	161,051us-gaap_CasinoExpenses	158,019us-gaap_CasinoExpenses	150,075us-gaap_CasinoExpenses
Gaming taxes	265,527isle_GamingTaxes	251,901isle_GamingTaxes	238,387isle_GamingTaxes
Rooms	6,773us-gaap_OccupancyCosts	7,023us-gaap_OccupancyCosts	6,654us-gaap_OccupancyCosts
Food, beverage, pari-mutuel and other	49,542	46,900	43,940
Marine and facilities	58,144isle_MarineAndFacilities	57,624isle_MarineAndFacilities	54,509isle_MarineAndFacilities
Marketing and administrative	234,471	234,690	226,397
Corporate and development	29,088isle_CorporateAndDevelopmentExpenses	28,455isle_CorporateAndDevelopmentExpenses	33,953isle_CorporateAndDevelopmentExpenses
Valuation charges	9,000us-gaap_AssetImpairmentCharges	162,100us-gaap_AssetImpairmentCharges	50,100us-gaap_AssetImpairmentCharges
Litigation accrual reversals		(9,330)
Preopening expense		3,898us-gaap_PreOpeningCosts	5,765us-gaap_PreOpeningCosts
Depreciation and amortization	78,875us-gaap_DepreciationAndAmortization	80,885us-gaap_DepreciationAndAmortization	71,164us-gaap_DepreciationAndAmortization
Total operating expenses	892,471us-gaap_OperatingExpenses	1,022,165us-gaap_OperatingExpenses	880,944us-gaap_OperatingExpenses
Operating income (loss)	103,807us-gaap_OperatingIncomeLoss	(67,565)us-gaap_OperatingIncomeLoss	42,461us-gaap_OperatingIncomeLoss
Interest expense	(84,131)us-gaap_InterestExpense	(81,342)us-gaap_InterestExpense	(89,446)us-gaap_InterestExpense
Interest income	369us-gaap_InvestmentIncomeInterest	349us-gaap_InvestmentIncomeInterest	502us-gaap_InvestmentIncomeInterest
Loss on early extinguishment of debt	(13,757)
Derivative income		398	748
Income (loss) from continuing operations before income taxes	6,288	(148,160)	(45,735)
Income tax (provision) benefit	(1,111)us-gaap_IncomeTaxExpenseBenefit	18,494us-gaap_IncomeTaxExpenseBenefit	(6,732)us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations	5,177	(129,666)	(52,467)
Income from discontinued operations including loss on sale, net of income tax provision of $0, ($1,226), and $0 for the fiscal years ended 2015, 2014 and 2013, respectively		1,980	4,898
Net income (loss) attributable to common stockholders	$ 5,177	$ (127,686)	$ (47,569)
Earnings (loss) per common share attributable to common stockholders - basic:
Income (loss) from continuing operations (in dollars per share)	$ 0.13	$ (3.26)	$ (1.33)
Income from discontinued operations including gain on sale, net of income taxes (in dollars per share)		$ 0.05	$ 0.12
Net income (loss) attributable to common stockholders (in dollars per share)	$ 0.13us-gaap_EarningsPerShareBasic	$ (3.21)us-gaap_EarningsPerShareBasic	$ (1.21)us-gaap_EarningsPerShareBasic
Earnings (loss) per common share attributable to common stockholders - diluted
Income (loss) from continuing operations (in dollars per share)	$ 0.13	$ (3.26)	$ (1.33)
Income from discontinued operations (in dollars per share)		$ 0.05	$ 0.12
Net income (loss) attributable to common stockholders (in dollars per share)	$ 0.13us-gaap_EarningsPerShareDiluted	$ (3.21)us-gaap_EarningsPerShareDiluted	$ (1.21)us-gaap_EarningsPerShareDiluted
Weighted average basic shares (in shares)	39,955,735.00	39,731,766.00	39,340,325.00
Weighted average diluted shares (in shares)	40,320,267	39,731,766	39,340,325

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Costs incurred and are directly related to generating occupancy revenues.

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Revenue derived from the provision of short term lodging; it does not apply to lease or rental income. Includes hotel rooms, cruise revenue, and other revenue related to lodgings.

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The net result for the period of deducting operating expenses from operating revenues.

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Expenditures associated with opening new locations which are noncapital in nature and expensed as incurred.

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This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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