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Restructuring and Other Charges - Activities Related to Restructuring Reserves (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	$ 26.5us-gaap_RestructuringReserve	$ 0us-gaap_RestructuringReserve
Net charges	0us-gaap_RestructuringCharges	88.3us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges
Cash payments	(26.5)us-gaap_PaymentsForRestructuring	(61.8)us-gaap_PaymentsForRestructuring
Balance at end of period	0us-gaap_RestructuringReserve	26.5us-gaap_RestructuringReserve	0us-gaap_RestructuringReserve
March 2014 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	26.5	0
Net charges	0	38.8
Cash payments	(26.5)	(12.3)
Balance at end of period	0	26.5
May 2013 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	0	0
Net charges	0	49.5
Cash payments	0	(49.5)
Balance at end of period	$ 0	$ 0

- 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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