Employee Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Postemployment Benefits [Abstract]
Maximum employee contribution as percentage of pre-tax salary (percent)	50.00%
Employees' participation eligibility period	30 days
Company's contribution expenses	$ 1.6	$ 3.2	$ 3.4