Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Oct. 28, 2011	Oct. 29, 2010
Cash flows from operating activities:
Net income	$ 305.1	$ 326.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	136.9	82.3
Stock-based compensation	121.1	82.0
Accretion of discount and issuance costs on notes	25.2	25.9
Deferred income taxes	(71.2)	(29.6)
Tax benefit from stock-based compensation	79.1	49.8
Excess tax benefit from stock-based compensation	(84.7)	(41.6)
Other non-cash items, net	(3.2)	10.2
Changes in assets and liabilities, net of acquisition of businesses:
Accounts receivable	115.6	21.4
Inventories	(18.3)	31.0
Other operating assets	(12.5)	33.9
Accounts payable	45.6	(18.6)
Accrued compensation and other current liabilities	(173.1)	(96.1)
Deferred revenue	126.9	28.2
Other operating liabilities	18.3	28.2
Net cash provided by operating activities	610.8	533.1
Cash flows from investing activities:
Purchases of investments	(1,306.6)	(1,650.1)
Redemptions of investments	1,347.0	1,055.3
Purchases of property and equipment	(191.6)	(83.5)
Acquisition of businesses, net of cash acquired	(480.0)	(74.9)
Other investing activities, net	2.0	0
Net cash used in investing activities	(629.2)	(753.2)
Cash flows from financing activities:
Issuance of common stock	51.9	236.1
Repurchase and retirement of common stock	(600.0)	0
Excess tax benefit from stock-based compensation	84.7	41.6
Other financing activities, net	1.6	(2.0)
Net cash provided by (used in) financing activities	(461.8)	275.7
Effect of exchange rate changes on cash and cash equivalents	(8.1)	10.5
Net increase (decrease) in cash and cash equivalents	(488.3)	66.1
Cash and cash equivalents:
Beginning of period	2,757.3	1,705.0
End of period	$ 2,269.0	$ 1,771.1