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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 31, 2015
Jan. 25, 2014
Jan. 31, 2015
Jan. 25, 2014
Net income $ 8,808us-gaap_NetIncomeLoss $ 7,136us-gaap_NetIncomeLoss $ 37,129us-gaap_NetIncomeLoss $ 31,703us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax:        
Cash flow hedges, net of tax (846)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 342us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (235)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 383us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Comprehensive income $ 7,962us-gaap_ComprehensiveIncomeNetOfTax $ 7,478us-gaap_ComprehensiveIncomeNetOfTax $ 36,894us-gaap_ComprehensiveIncomeNetOfTax $ 32,086us-gaap_ComprehensiveIncomeNetOfTax