CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Operating activities
Net income (loss)	$ 214.5	$ (80.8)	$ (566.9)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization, and accretion	127.3	95.2	108.4
Stock-based compensation expense	362.4	249.5	261.4
Deferred income taxes	10.3	(6.8)	(39.1)
Restructuring and other exit costs, net	0.5	31.7	94.1
Other operating activities	(11.9)	2.2	7.3
Changes in operating assets and liabilities, net of business combinations:
Accounts receivable	(178.5)	(25.4)	13.3
Prepaid expenses and other current assets	58.5	7.5	(9.9)
Accounts payable and accrued liabilities	(90.8)	(58.5)	(13.9)
Deferred revenue	916.7	197.0	168.3
Accrued income taxes	6.1	(34.5)	(22.1)
Net cash provided by operating activities	1,415.1	377.1	0.9
Investing activities
Purchases of marketable securities	(19.9)	(138.2)	(514.0)
Sales of marketable securities	22.4	319.6	489.0
Maturities of marketable securities	5.0	211.4	594.3
Acquisitions, net of cash acquired	0.0	(1,040.2)	0.0
Capital expenditures	(53.2)	(67.0)	(50.7)
Other investing activities	(11.6)	4.0	(12.2)
Net cash (used in) provided by investing activities	(57.3)	(710.4)	506.4
Financing activities
Proceeds from issuance of common stock	93.7	90.9	94.4
Taxes paid related to net share settlement of equity awards	(112.5)	(143.4)	(143.1)
Repurchase and retirement of common shares	(442.5)	(293.5)	(699.0)
Proceeds from debt, net of discount	498.9	500.0	496.9
Repayments of debt	(500.0)	0.0	(400.0)
Other financing activities	(4.4)	(2.1)	(5.8)
Net cash (used in) provided by financing activities	(466.8)	151.9	(656.6)
Effect of exchange rate changes on cash and cash equivalents	(2.3)	(10.6)	14.2
Net increase (decrease) in cash and cash equivalents	888.7	(192.0)	(135.1)
Cash and cash equivalents at beginning of fiscal year	886.0	1,078.0	1,213.1
Cash and cash equivalents at end of fiscal year	1,774.7	886.0	1,078.0
Supplemental cash flow information:
Cash paid during the year for interest	67.8	59.0	54.6
Cash paid for income taxes, net of tax refunds	60.3	78.0	84.5
Non-cash investing and financing activities:
Fair value of common stock issued to settle liability-classified restricted stock units	23.5	0.0	0.0
Fair value of equity awards assumed	0.0	10.3	0.0
Fair value of common stock issued as consideration for business combination	$ 0.0	$ 44.8	$ 0.0