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Estimated Net Amortization of Intangibles (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 25, 2015
Schedule Of Estimated Future Amortization Expense [Line Items]  
Remainder of 2015 $ 8,119us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 11,302us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 10,830us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 10,682us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 $ 10,553us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive