CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Operating activities:
Net loss	$ (121.8)	$ (273.6)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation, amortization and accretion	46.3	56.8
Stock-based compensation expense	111.3	134.4
Deferred income taxes	(0.3)	8.6
Restructuring and other exit costs, net	36.6	0.2
Other operating activities	(1.3)	7.7
Changes in operating assets and liabilities
Accounts receivable	204.2	185.5
Prepaid expenses and other current assets	7.9	(2.4)
Accounts payable and accrued liabilities	(201.3)	(98.6)
Deferred revenue	(66.7)	(9.9)
Accrued income taxes	11.5	(36.0)
Net cash provided by (used in) operating activities	26.4	(27.3)
Investing activities:
Purchases of marketable securities	(110.1)	(299.7)
Sales of marketable securities	27.0	110.8
Maturities of marketable securities	119.6	420.3
Capital expenditures	(36.7)	(26.4)
Acquisitions, net of cash acquired	(34.1)	0.0
Other investing activities	(6.0)	(4.3)
Net cash (used in) provided by investing activities	(40.3)	200.7
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	50.4	55.9
Taxes paid related to net share settlement of equity awards	(53.0)	(49.8)
Repurchases of common stock	(154.7)	(315.2)
Proceeds from debt, net of discount	0.0	496.9
Repayment of debt	0.0	(400.0)
Other financing activities	0.0	(5.8)
Net cash used in financing activities	(157.3)	(218.0)
Effect of exchange rate changes on cash and cash equivalents	(11.4)	5.6
Net decrease in cash and cash equivalents	(182.6)	(39.0)
Cash and cash equivalents at beginning of period	1,078.0	1,213.1
Cash and cash equivalents at end of period	895.4	1,174.1
Non-cash investing activities:
Fair value of common stock issued as consideration for business combination (See Note 8)	$ 44.8	$ 0.0