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Effect of Interest Rate Contracts on Consolidated Statements of Income (Detail) (Interest rate contracts, Other income (expense), net, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012
Interest rate contracts \| Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on derivative	$ (4)	$ 0	$ 72	$ 2

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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