Stockholders Equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 26, 2013	Jul. 27, 2012
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income (expense), net	$ 1.9	$ 3.1
Net revenues	1,516.2	1,444.6
Net income	81.6	63.8
Reclassification out of Accumulated Other Comprehensive Income
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	(1.1)	(4.6)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains on Available-for-Sale Securities
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income (expense), net	(0.1)	(0.1)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivative Instruments
Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) [Line Items]
Net revenues	$ (1.0)	$ (4.5)