CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Operating activities:
Net (loss) income	$ (293.3)	$ 70.3
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion	109.7	109.9
Stock-based compensation expense	141.1	116.5
Deferred income taxes	221.9	(13.7)
Restructuring charges, net	0.0	3.1
Other operating activities	(10.6)	9.5
Changes in operating assets and liabilities, net of business combinations:
Accounts receivable	97.4	65.9
Prepaid expenses and other current assets	(5.5)	7.7
Accounts payable and accrued liabilities	(75.1)	7.6
Deferred revenue	54.5	94.3
Accrued income taxes	4.0	(20.2)
Net cash provided by operating activities	244.1	450.9
Investing activities:
Purchases of marketable securities	(1,827.9)	(899.0)
Sales of marketable securities	263.0	160.7
Maturities of marketable securities	970.7	623.2
Capital expenditures	(41.8)	(60.0)
Acquisitions, net of cash acquired	(104.6)	(603.8)
Other investing activities	(15.5)	1.2
Net cash used in investing activities	(756.1)	(777.7)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	57.0	129.6
Repurchase and retirement of common shares	(357.7)	(307.6)
Proceeds from debt, net of discount	748.3	0.0
Other financing activities	(6.3)	(1.7)
Net cash provided by (used in) financing activities	441.3	(179.7)
Effect of exchange rate changes on cash and cash equivalents	(2.4)	(1.5)
Net (decrease) in cash and cash equivalents	(73.1)	(508.0)
Cash and cash equivalents at beginning of fiscal year	1,410.6	1,853.0
Cash and cash equivalents at end of period	$ 1,337.5	$ 1,345.0