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Restructuring and Other Charges - Activities Related to Restructuring Reserves (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 24, 2014	Jan. 25, 2013	Jan. 24, 2014	Jan. 25, 2013
Restructuring Cost and Reserve [Line Items]
Net charges	$ 0	$ 0	$ 49.5	$ 0
Cash payments			(48.9)
Ending balance, reserve	$ 0.6		$ 0.6

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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