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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Apr. 26, 2015
Apr. 27, 2014
Apr. 28, 2013
Apr. 14, 2015
Apr. 07, 2015
Aug. 07, 2012
Mar. 31, 2013
Mar. 31, 2011
May 14, 2015
Long-Term Debt                  
Long-term debt, including current maturities $ 992,882us-gaap_LongTermDebt $ 1,066,301us-gaap_LongTermDebt              
Less current maturities 170us-gaap_LongTermDebtCurrent 230us-gaap_LongTermDebtCurrent              
Long-term debt 992,712us-gaap_LongTermDebtNoncurrent 1,066,071us-gaap_LongTermDebtNoncurrent              
Repayments of Senior Debt 238,061us-gaap_RepaymentsOfSeniorDebt 626us-gaap_RepaymentsOfSeniorDebt 852,667us-gaap_RepaymentsOfSeniorDebt            
Senior Secured Credit Facility:                  
Long-Term Debt                  
Non-cash charges included in fees and write-off of certain unamortized deferred financing costs     2,236isle_NonCashChargesIncludedInWriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSecuredCreditFacilityMember
           
Capitalized deferred financing costs     6,288us-gaap_DeferredFinanceCostsNoncurrentGross
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSecuredCreditFacilityMember
           
Revolving line of credit, expires April 19, 2018                  
Long-Term Debt                  
Long-term debt, including current maturities 75,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
64,700us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
             
Maximum borrowing capacity 300,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
               
Net line of credit availability 218,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
               
Outstanding letters of credit 7,000isle_SuretyBondsAndLettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
               
Weighted average effective interest rate (as a percent) 3.54%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
3.95%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
             
Capitalized deferred financing costs   673us-gaap_DeferredFinanceCostsNoncurrentGross
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
             
Revolving line of credit, expires April 19, 2018 | Maximum                  
Long-Term Debt                  
Commitment fee related to the unused portion (as a percent) 0.55%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
               
5.875% Senior Notes, interest payable semi-annually March 15 and September 15                  
Long-Term Debt                  
Interest rate (as a percent) 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
        5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
   
Long-term debt, including current maturities 502,987us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
350,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
             
Debt Instrument, Increase (Decrease), Net       150,000us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
         
Proceeds from Issuance of Debt       151,500us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
         
Capitalized deferred financing costs 2,536us-gaap_DeferredFinanceCostsNoncurrentGross
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
  7,060us-gaap_DeferredFinanceCostsNoncurrentGross
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
           
Debt issued             350,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
   
Debt instrument issuance as a percentage of the face amount       102.00%isle_DebtInstrumentIssuanceAsPercentageOfFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorNotes5.875PercentDue2021Member
         
7.75% Senior Notes, interest payable semi-annually March 15 and September 15, net                  
Long-Term Debt                  
Interest rate (as a percent) 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
            7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Long-term debt, including current maturities 62,012us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
298,488us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
             
Debt issued               300,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Debt instrument issuance as a percentage of the face amount               99.264%isle_DebtInstrumentIssuanceAsPercentageOfFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Repayments of Senior Debt         237,832us-gaap_RepaymentsOfSeniorDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Repurchased face amount       62,168us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
         
Redemption tender price percentage         1.043%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Repurchased tender amount including premium         250,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Expenses related to fees and write-off of certain unamortized deferred financing costs         13,757us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
7.75% Senior Notes, interest payable semi-annually March 15 and September 15, net | Subsequent event                  
Long-Term Debt                  
Redemption tender price percentage       103.875%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Repurchased tender amount including premium                 65,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
8.875% Senior Subordinated Notes, interest payable semi-annually June 15 and December 15                  
Long-Term Debt                  
Interest rate (as a percent) 8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
        8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
     
Long-term debt, including current maturities 350,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
350,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
             
Non-cash charges included in fees and write-off of certain unamortized deferred financing costs     1,000isle_NonCashChargesIncludedInWriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
           
Capitalized deferred financing costs     8,137us-gaap_DeferredFinanceCostsNoncurrentGross
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
           
Debt issued           350,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
     
Net proceeds from issuance of debt after deducting underwriting fees           343,000isle_ProceedsFromIssuanceOfDebtNetOfUnderwritingDiscounts
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
     
Expenses related to fees and write-off of certain unamortized deferred financing costs     2,500us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
           
Repayment and repurchase of debt           357,275us-gaap_RepaymentsOfDebt
/ us-gaap_LongtermDebtTypeAxis
= isle_SeniorSubordinatedNotes8.875PercentDue2020Member
     
Other                  
Long-Term Debt                  
Long-term debt, including current maturities $ 2,883us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= isle_OtherDebtMember
$ 3,113us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= isle_OtherDebtMember