CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Operating activities:
Net (loss) income	$ (216.4)	$ 59.6
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and accretion	74.0	73.3
Stock-based compensation expense	90.9	73.4
Deferred income taxes	197.9	1.1
Restructuring charges, net	0.0	3.1
Other operating activities	(15.3)	5.5
Changes in operating assets and liabilities, net of business combinations:
Accounts receivable	64.4	76.3
Prepaid expenses and other current assets	(19.4)	(7.8)
Accounts payable and accrued liabilities	(81.5)	(21.5)
Deferred revenue	79.2	68.9
Accrued income taxes	(10.1)	(17.0)
Net cash provided by operating activities	163.7	314.9
Investing activities:
Purchases of marketable securities	(1,314.2)	(684.2)
Sales of marketable securities	187.0	127.3
Maturities of marketable securities	541.0	407.1
Capital expenditures	(29.8)	(31.6)
Acquisitions, net of cash acquired	(37.5)	(548.3)
Other investing activities	(13.1)	(0.7)
Net cash used in investing activities	(666.6)	(730.4)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	33.2	91.3
Repurchase and retirement of common shares	(207.7)	(204.3)
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	567.5	(114.7)
Effect of exchange rate changes on cash and cash equivalents	(2.1)	0.3
Net increase (decrease) in cash and cash equivalents	62.5	(529.9)
Cash and cash equivalents at beginning of fiscal year	1,410.6	1,853.0
Cash and cash equivalents at end of period	$ 1,473.1	$ 1,323.1