Stockholders Equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 25, 2014	Jan. 24, 2014	Oct. 25, 2013	Jul. 26, 2013	Apr. 26, 2013	Jan. 25, 2013	Oct. 26, 2012	Jul. 27, 2012	Apr. 25, 2014	Apr. 26, 2013	Apr. 27, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses									$ 3,184.8	$ 3,153.3	$ 2,966.9
Other income (expense), net									(7.6)	(8.3)	(2.4)
Net revenues	(1,649.0)	(1,610.0)	(1,549.9)	(1,516.2)	(1,716.5)	(1,630.1)	(1,541.2)	(1,444.6)	(6,325.1)	(6,332.4)	(6,233.2)
Net income	(197.0)	(192.1)	(166.8)	(81.6)	(173.8)	(158.1)	(109.6)	(63.8)	(637.5)	(505.3)	(605.4)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income									1.1	(2.8)	(19.4)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains on Available-for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net									(1.3)	(0.6)	(0.5)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net revenues									2.0	(2.2)	(18.9)
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Obligation Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses									$ 0.4	$ 0	$ 0