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Aggregate Maturities of Debt Outstanding (Including Capital Leases) (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 25, 2015
Long Term Debt Maturities Repayments Of Principal [Line Items]  
2015 $ 25,922us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
2016 71,937us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo
2017 116,935us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree
2018 64,690us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour
2019 6,776us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive
2020 and thereafter 421,493us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive
Total $ 707,753us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities