CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Operating activities:
Net income	$ 59.6	$ 117.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	73.3	65.1
Stock-based compensation expense	73.4	64.6
Excess tax benefits from stock-based compensation	0	(3.2)
Restructuring charges, net	3.1	2.1
Other operating activities	5.5	2.0
Changes in operating assets and liabilities, net of business combinations	100.0	41.5
Net cash provided by operating activities	314.9	289.4
Investing activities:
Purchases of marketable securities	(684.2)	(697.3)
Sales of marketable securities	127.3	215.1
Maturities of marketable securities	407.1	231.9
Capital expenditures	(31.6)	(42.6)
Acquisitions, net of cash acquired	(548.3)	(47.2)
Other investing activities	(0.7)	(5.4)
Net cash used in investing activities	(730.4)	(345.5)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	91.3	79.8
Repurchase and retirement of common shares	(204.3)	(239.8)
Excess tax benefits from stock-based compensation	0	3.2
Other financing activities	(1.7)	0
Net cash used in financing activities	(114.7)	(156.8)
Effect of exchange rate changes on cash and cash equivalents	0.3	1.7
Net decrease in cash and cash equivalents	(529.9)	(211.2)
Cash and cash equivalents at beginning of fiscal year	1,853.0	1,612.2
Cash and cash equivalents at end of period	$ 1,323.1	$ 1,401.0