CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) shares in Millions, $ in Millions	Total	Cumulative effect, period of adoption, adjustment	Common stock and additional paid-in capital	Accumulated other comprehensive (loss) income	Accumulated deficit	Accumulated deficit Cumulative effect, period of adoption, adjustment
Beginning Balance (in shares) at Jan. 31, 2019			219.4
Beginning Balance at Jan. 31, 2019	$ (210.9)	$ (0.7)	$ 2,071.5	$ (135.0)	$ (2,147.4)	$ (0.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares issued under stock plans (in shares)			2.7
Common stock issued under stock plans	(18.6)		$ (18.6)
Stock-based compensation expense	332.7		332.7
Settlement of liability-classified restricted stock units	23.5		23.5
Post-combination expense related to equity awards assumed	1.2		$ 1.2
Net income	214.5				214.5
Other comprehensive income (loss)	(25.3)			(25.3)
Repurchase and retirement of common shares (in shares)			(2.7)
Repurchase and retirement of common stock	(455.5)		$ (93.3)		(362.2)
Ending Balance (in shares) at Jan. 31, 2020			219.4
Ending Balance at Jan. 31, 2020	(139.1)		$ 2,317.0	(160.3)	(2,295.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares issued under stock plans (in shares)			2.7
Common stock issued under stock plans	(41.2)		$ (41.2)
Stock-based compensation expense	385.6		385.6
Settlement of liability-classified restricted stock units	28.7		28.7
Post-combination expense related to equity awards assumed	0.4		$ 0.4
Net income	1,208.2				1,208.2
Other comprehensive income (loss)	34.4			34.4
Shares issued related to business combination (in shares)			0.1
Shares issued related to business combination	37.9		$ 37.9
Repurchase and retirement of common shares (in shares)			(2.6)
Repurchase and retirement of common stock	$ (549.4)		$ (149.5)		(399.9)
Ending Balance (in shares) at Jan. 31, 2021	219.6		219.6
Ending Balance at Jan. 31, 2021	$ 965.5		$ 2,578.9	(125.9)	(1,487.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares issued under stock plans (in shares)			2.6
Common stock issued under stock plans	(79.8)		$ (79.8)
Stock-based compensation expense	544.4		544.4
Settlement of liability-classified restricted stock units	2.7		2.7
Post-combination expense related to equity awards assumed	0.1		0.1
Net income	497.0				497.0
Other comprehensive income (loss)	1.9			1.9
Shares issued related to business combination	6.1		$ 6.1
Repurchase and retirement of common shares (in shares)			(4.0)
Repurchase and retirement of common stock	$ (1,088.8)		$ (129.3)		(959.5)
Ending Balance (in shares) at Jan. 31, 2022	218.2		218.2
Ending Balance at Jan. 31, 2022	$ 849.1		$ 2,923.1	$ (124.0)	$ (1,950.0)