CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Operating activities:
Net income	$ 164.7	$ 16.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	60.0	64.8
Stock-based compensation expense	194.1	163.4
Deferred income taxes	14.5	35.8
Restructuring and other exit costs, net	0.0	0.4
Other	36.0	(4.2)
Changes in operating assets and liabilities
Accounts receivable	162.7	125.8
Prepaid expenses and other assets	(52.0)	27.4
Accounts payable and other liabilities	(42.8)	(138.1)
Deferred revenue	(130.0)	158.3
Accrued income taxes	11.3	(9.1)
Net cash provided by operating activities	418.5	440.5
Investing activities:
Purchases of marketable securities	(17.0)	(19.9)
Sales of marketable securities	0.0	22.4
Maturities of marketable securities	11.0	5.0
Capital expenditures	(46.7)	(29.5)
Purchases of developed technologies	(4.8)	0.0
Other investing activities	(54.3)	(10.5)
Net cash used in investing activities	(111.8)	(32.5)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	58.5	49.7
Taxes paid related to net share settlement of equity awards	(39.6)	(31.2)
Repurchases of common stock	(209.0)	(134.6)
Repayment of debt	(450.0)	(250.0)
Other financing activities	(2.5)	0.0
Net cash used in financing activities	(642.6)	(366.1)
Effect of exchange rate changes on cash and cash equivalents	1.0	(4.0)
Net (decrease) increase in cash and cash equivalents	(334.9)	37.9
Cash and cash equivalents at beginning of period	1,774.7	886.0
Cash and cash equivalents at end of period	1,439.8	923.9
Non-cash financing activities:
Fair value of common stock issued to settle liability-classified restricted stock units	$ 28.7	$ 0.0