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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 3 Months Ended 9 Months Ended
Apr. 26, 2015
Apr. 27, 2014
Apr. 28, 2013
Oct. 27, 2013
item
Jan. 26, 2014
Jan. 26, 2014
Feb. 01, 2013
Future minimum payments over the lease term              
2016 $ 11,508us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent            
2017 11,023us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears            
2018 10,751us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears            
2019 10,692us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears            
2020 8,123us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears            
Thereafter 144,348us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter            
Total minimum lease payments 196,445us-gaap_OperatingLeasesFutureMinimumPaymentsDue            
Rent expense related to continuing operations 26,376us-gaap_LeaseAndRentalExpense 27,721us-gaap_LeaseAndRentalExpense 27,363us-gaap_LeaseAndRentalExpense        
Contingent rentals 3,012us-gaap_OperatingLeasesRentExpenseContingentRentals 2,926us-gaap_OperatingLeasesRentExpenseContingentRentals 3,315us-gaap_OperatingLeasesRentExpenseContingentRentals        
Commitments and Contingencies              
Litigation accrual reversal   16,953isle_GainLossRelatedToLitigationSettlementCashFlowImpact          
Operating expense (892,471)us-gaap_OperatingExpenses (1,022,165)us-gaap_OperatingExpenses (880,944)us-gaap_OperatingExpenses        
Interest expense (84,131)us-gaap_InterestExpense (81,342)us-gaap_InterestExpense (89,446)us-gaap_InterestExpense        
Tower JV              
Commitments and Contingencies              
Amount loaned in the form of stand-by letter of credit             25,000us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= isle_TowerEntertainmentLLCMember
Sub Contractor Vs I O C Cape Girardeau L L C And Other Defendants              
Commitments and Contingencies              
Amount of damages sought       3,800us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= isle_SubContractorVsIOCCapeGirardeauLLCAndOtherDefendantsMember
     
Number of defendants       2us-gaap_LossContingencyNumberOfDefendants
/ us-gaap_LitigationCaseAxis
= isle_SubContractorVsIOCCapeGirardeauLLCAndOtherDefendantsMember
     
Riverboat Corporation of Mississippi - Vicksburg vs. Mississippi by Silver Land, Inc.              
Commitments and Contingencies              
Damages awarded         1,979us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember
1,979us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember
 
Litigation accrual reversal         2,223isle_GainLossRelatedToLitigationSettlementCashFlowImpact
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember
2,223isle_GainLossRelatedToLitigationSettlementCashFlowImpact
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember
 
Operating expense         1,979us-gaap_OperatingExpenses
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember
1,979us-gaap_OperatingExpenses
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember
 
Interest expense         244us-gaap_InterestExpense
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember
244us-gaap_InterestExpense
/ us-gaap_LitigationCaseAxis
= isle_IsleOfCapriCasinosIncAndRiverboatCorporationOfMississippiVicksburgVsSilverLandIncMember
 
Lady Luck Gaming Corporation and several joint venture partners vs. country of Greece              
Commitments and Contingencies              
Litigation accrual reversal           14,730isle_GainLossRelatedToLitigationSettlementCashFlowImpact
/ us-gaap_LitigationCaseAxis
= isle_LadyLuckGamingCorporationAndSeveralJointVenturePartnersVsGreeceMember
 
Operating expense           7,351us-gaap_OperatingExpenses
/ 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