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Aggregate Amortization Expense (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 26, 2013	Jan. 28, 2012
Changes In Intangible Assets And Goodwill
Aggregate Amortization Expense	$ 16,176	$ 12,980

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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