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Restructuring and Other Charges - Activities Related to Restructuring Reserves (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 26, 2013	Jul. 27, 2012
Restructuring Cost and Reserve [Line Items]
Gross charges	$ 48.4	$ 0
Cash payments	(24.6)
Ending balance, reserve	$ 23.8

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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