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Aggregate Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 27, 2012	Oct. 29, 2011
Changes In Intangible Assets And Goodwill [Abstract]
Aggregate Amortization Expense	$ 11,095	$ 7,467

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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