CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 25, 2014	Jul. 26, 2013
Net income	$ 88.4	$ 81.6
Other comprehensive income (loss):
Foreign currency translation adjustments	(0.8)	(1.2)
Defined benefit obligations:
Defined benefit obligation adjustments	1.5	0.1
Income tax effect on defined benefit obligations	(0.5)	0
Reclassification adjustment for actuarial net losses from defined benefit obligations into earnings	0.1	0
Unrealized gains (losses) on available-for-sale securities:
Unrealized holding losses arising during the period	(1.8)	(8.4)
Income tax effect on unrealized holding gains	0.2	1.0
Reclassification adjustments for (gains) losses included in net income	0.2	(0.1)
Unrealized gains (losses) on cash flow hedges:
Unrealized holding losses arising during the period	(0.6)	(0.4)
Reclassification adjustments for (gains) losses included in net income	1.7	(1.0)
Other comprehensive income (loss)	0	(10.0)
Comprehensive income	$ 88.4	$ 71.6