CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Operating activities
Net loss	$ (80.8)	$ (566.9)	$ (582.1)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization, and accretion	95.2	108.4	139.2
Stock-based compensation expense	249.5	261.4	221.8
Deferred income taxes	(6.8)	(39.1)	(38.8)
Restructuring and other exit costs, net	31.7	94.1	80.5
Other operating activities	2.2	7.3	(7.7)
Changes in operating assets and liabilities, net of business combinations:
Accounts receivable	(25.4)	13.3	201.5
Prepaid expenses and other current assets	7.5	(9.9)	(13.5)
Accounts payable and accrued liabilities	(58.5)	(13.9)	2.7
Deferred revenue	197.0	168.3	267.0
Accrued income taxes	(34.5)	(22.1)	(100.9)
Net cash provided by operating activities	377.1	0.9	169.7
Investing activities
Purchases of marketable securities	(138.2)	(514.0)	(1,867.9)
Sales of marketable securities	319.6	489.0	1,257.7
Maturities of marketable securities	211.4	594.3	1,057.2
Acquisitions, net of cash acquired	(1,040.2)	0.0	(85.2)
Capital expenditures	(67.0)	(50.7)	(76.0)
Other investing activities	4.0	(12.2)	(13.8)
Net cash (used in) provided by investing activities	(710.4)	506.4	272.0
Financing activities
Proceeds from issuance of common stock	90.9	94.4	119.6
Taxes paid related to net share settlement of equity awards	(143.4)	(143.1)	(76.2)
Repurchase and retirement of common shares	(293.5)	(699.0)	(621.7)
Proceeds from debt, net of discount	500.0	496.9	0.0
Repayments of debt	0.0	(400.0)	0.0
Other financing activities	(2.1)	(5.8)	0.0
Net cash provided by (used in) financing activities	151.9	(656.6)	(578.3)
Effect of exchange rate changes on cash and cash equivalents	(10.6)	14.2	(3.3)
Net decrease in cash and cash equivalents	(192.0)	(135.1)	(139.9)
Cash and cash equivalents at beginning of fiscal year	1,078.0	1,213.1	1,353.0
Cash and cash equivalents at end of fiscal year	886.0	1,078.0	1,213.1
Supplemental cash flow information:
Cash paid during the year for interest	59.0	54.6	47.6
Cash paid for income taxes, net of tax refunds	78.0	84.5	77.7
Non-cash investing and financing activities:
Fair value of equity awards assumed (See Note 6)	10.3	0.0	0.0
Fair value of common stock issued as consideration for business combination (See Note 6)	$ 44.8	$ 0.0	$ 0.0