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Stock-Based Compensation - Restricted Common Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 06, 2021	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense		$ 21,393	$ 1,588	$ 34,830	$ 5,239
Restricted common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense		3,100		5,500
Cost not yet recognized amount		$ 14,100		$ 14,100
Cost not yet recognized, period for recognition				1 year 1 month 6 days
Restricted common stock \| Scalyr
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	1,315,099
Shares granted, fair value (in USD per share)	$ 14.59
Award vesting period	2 years