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Selected Quarterly Financial Information (unaudited) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 9 Months Ended
Apr. 26, 2015
Jan. 25, 2015
Oct. 26, 2014
Jul. 27, 2014
Apr. 27, 2014
Jan. 26, 2014
Oct. 27, 2013
Jul. 28, 2013
Apr. 26, 2015
Apr. 27, 2014
Apr. 28, 2013
Jan. 26, 2014
Selected Quarterly Financial Information (unaudited)                        
Net revenues $ 274,648us-gaap_Revenues $ 241,064us-gaap_Revenues $ 238,917us-gaap_Revenues $ 241,649us-gaap_Revenues $ 260,776us-gaap_Revenues $ 224,190us-gaap_Revenues $ 231,621us-gaap_Revenues $ 238,013us-gaap_Revenues $ 996,278us-gaap_Revenues $ 954,600us-gaap_Revenues $ 923,405us-gaap_Revenues  
Operating income (loss) 35,832us-gaap_OperatingIncomeLoss 27,042us-gaap_OperatingIncomeLoss 21,025us-gaap_OperatingIncomeLoss 19,908us-gaap_OperatingIncomeLoss (126,220)us-gaap_OperatingIncomeLoss 17,947us-gaap_OperatingIncomeLoss 22,611us-gaap_OperatingIncomeLoss 18,097us-gaap_OperatingIncomeLoss 103,807us-gaap_OperatingIncomeLoss (67,565)us-gaap_OperatingIncomeLoss 42,461us-gaap_OperatingIncomeLoss  
Income (loss) from continuing operations 3,092us-gaap_IncomeLossFromContinuingOperations 5,423us-gaap_IncomeLossFromContinuingOperations (1,021)us-gaap_IncomeLossFromContinuingOperations (2,317)us-gaap_IncomeLossFromContinuingOperations (139,720)us-gaap_IncomeLossFromContinuingOperations 9,391us-gaap_IncomeLossFromContinuingOperations 6,311us-gaap_IncomeLossFromContinuingOperations (5,648)us-gaap_IncomeLossFromContinuingOperations 5,177us-gaap_IncomeLossFromContinuingOperations (129,666)us-gaap_IncomeLossFromContinuingOperations (52,467)us-gaap_IncomeLossFromContinuingOperations  
Income (loss) from discontinued operations, net of income taxes         (1,798)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 1,266us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 1,726us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 786us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity   1,980us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 4,898us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity  
Net income (loss) 3,092us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 5,423us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (1,021)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (2,317)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (141,518)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 10,657us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 8,037us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (4,862)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 5,177us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (127,686)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (47,569)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic  
Earnings per common share-basic:                        
Income (loss) from continuing operations (in dollars per share) $ 0.08us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.14us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.03)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.06)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (3.51)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.24us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.16us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.13us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (3.26)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (1.33)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare  
Income (loss) from discontinued operations , net of income taxes (in dollars per share)         $ (0.04)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.03us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.04us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare   $ 0.05us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0.12us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare  
Net income (loss) attributable to common stockholders (in dollars per share) $ 0.08us-gaap_EarningsPerShareBasic $ 0.14us-gaap_EarningsPerShareBasic $ (0.03)us-gaap_EarningsPerShareBasic $ (0.06)us-gaap_EarningsPerShareBasic $ (3.55)us-gaap_EarningsPerShareBasic $ 0.27us-gaap_EarningsPerShareBasic $ 0.20us-gaap_EarningsPerShareBasic $ (0.12)us-gaap_EarningsPerShareBasic $ 0.13us-gaap_EarningsPerShareBasic $ (3.21)us-gaap_EarningsPerShareBasic $ (1.21)us-gaap_EarningsPerShareBasic  
Earnings per common share-diluted:                        
Income (loss) from continuing operations (in dollars per share) $ 0.08us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.13us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.03)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.06)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (3.51)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.24us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.16us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.14)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.13us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (3.26)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (1.33)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare  
Income (loss) from discontinued operations, net of income taxes (in dollars per share)         $ (0.04)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.03us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.04us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.02us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare   $ 0.05us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0.12us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare  
Net income (loss) attributable to common stockholders (in dollars per share) $ 0.08us-gaap_EarningsPerShareDiluted $ 0.13us-gaap_EarningsPerShareDiluted $ (0.03)us-gaap_EarningsPerShareDiluted $ (0.06)us-gaap_EarningsPerShareDiluted $ (3.55)us-gaap_EarningsPerShareDiluted $ 0.27us-gaap_EarningsPerShareDiluted $ 0.20us-gaap_EarningsPerShareDiluted $ (0.12)us-gaap_EarningsPerShareDiluted $ 0.13us-gaap_EarningsPerShareDiluted $ (3.21)us-gaap_EarningsPerShareDiluted $ (1.21)us-gaap_EarningsPerShareDiluted  
Weighted average shares                        
Weighted average basic shares (in shares) 40,033,404.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 40,028,776.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,932,856.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,827,889.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,829,177.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,828,740.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,686,217.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,582,928.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,955,735.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,731,766.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 39,340,325.00us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Weighted average diluted shares (in shares) 41,020,503us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 40,336,663us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 39,932,856us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 39,827,889us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 39,829,177us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 39,911,715us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 39,731,193us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 39,582,928us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 40,320,267us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 39,731,766us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 39,340,325us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding  
Litigation accrual recoveries                   9,330us-gaap_GainLossRelatedToLitigationSettlement    
Interest expense                 (84,131)us-gaap_InterestExpense (81,342)us-gaap_InterestExpense (89,446)us-gaap_InterestExpense  
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Impairment charge related to goodwill         133,825us-gaap_GoodwillImpairmentLoss         133,825us-gaap_GoodwillImpairmentLoss 50,100us-gaap_GoodwillImpairmentLoss  
Impairment charges                 9,000us-gaap_AssetImpairmentCharges 162,100us-gaap_AssetImpairmentCharges 50,100us-gaap_AssetImpairmentCharges  
Loss on early extinguishment of debt 13,757us-gaap_GainsLossesOnExtinguishmentOfDebt               13,757us-gaap_GainsLossesOnExtinguishmentOfDebt      
Nemacolin                        
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Impairment charges 9,000us-gaap_AssetImpairmentCharges
/ isle_DevelopmentProjectsAxis
= isle_NemacolinWoodlandsResortMember		       28,275us-gaap_AssetImpairmentCharges
/ isle_DevelopmentProjectsAxis
= isle_NemacolinWoodlandsResortMember		              
Lady Luck Gaming Corporation and several joint venture partners vs. country of Greece                        
Weighted average shares                        
Litigation accrual recoveries             7,351us-gaap_GainLossRelatedToLitigationSettlement
/ us-gaap_LitigationCaseAxis
= isle_LadyLuckGamingCorporationAndSeveralJointVenturePartnersVsGreeceMember		          
Interest expense             7,379us-gaap_InterestExpense
/ us-gaap_LitigationCaseAxis
= isle_LadyLuckGamingCorporationAndSeveralJointVenturePartnersVsGreeceMember		         7,379us-gaap_InterestExpense
/ us-gaap_LitigationCaseAxis
= isle_LadyLuckGamingCorporationAndSeveralJointVenturePartnersVsGreeceMember
Riverboat Corporation of Mississippi - Vicksburg vs. Mississippi by Silver Land, Inc.                        
Weighted average shares                        
Litigation accrual recoveries           1,979us-gaap_GainLossRelatedToLitigationSettlement
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember		            
Interest expense           244us-gaap_InterestExpense
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember		           244us-gaap_InterestExpense
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember
Corporate Segment [Member]                        
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Severance Costs       2,259us-gaap_SeveranceCosts1
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		                
Natchez, Mississippi                        
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Impairment charge related to goodwill         8,587us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_NatchezMississippiMember		         8,587us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_NatchezMississippiMember		 16,000us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_NatchezMississippiMember		  
Impairment charges         28,275us-gaap_AssetImpairmentCharges
/ dei_EntityByLocationAxis
= isle_NatchezMississippiMember		              
Lula, Mississippi                        
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Impairment charge related to goodwill         36,000us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_LulaMississippiPropertyMember		         36,000us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_LulaMississippiPropertyMember		 34,100us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_LulaMississippiPropertyMember		  
Vicksburg, Mississippi                        
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Impairment charge related to goodwill         5,000us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_VicksburgMississippiMember		         5,000us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_VicksburgMississippiMember		    
Lake Charles                        
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Impairment charge related to goodwill         24,238us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_LakeCharlesMember		         24,238us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_LakeCharlesMember		    
Bettendorf                        
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Impairment charge related to goodwill         60,000us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_BettendorfMember		         60,000us-gaap_GoodwillImpairmentLoss
/ dei_EntityByLocationAxis
= isle_BettendorfMember		    
Colorado                        
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Game expansion expenses     3,044isle_GameExpansionExpense
/ dei_EntityByLocationAxis
= isle_ColoradoMember		 1,013isle_GameExpansionExpense
/ dei_EntityByLocationAxis
= isle_ColoradoMember		                
Waterloo Property Member                        
Certain revenues and expenses from continuing operations impacting quarterly financial results                        
Property tax settlement     $ 1,225isle_PropertyTaxSettlement
/ dei_EntityByLocationAxis
= isle_WaterlooPropertyMember