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Summary of Effective Income Tax Expense Reconciliation (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 28, 2012
Apr. 30, 2011
Apr. 24, 2010
Income Taxes [Line Items]      
Tax at U.S. statutory rate $ 115,434 $ 124,561 $ 118,664
State tax provision, net of federal benefit 7,277 8,950 8,103
Effect of foreign taxes 530 2,398 1,411
Other (6,244) (5,407) (1,391)
Provision for income taxes $ 116,997 $ 130,502 $ 126,787