Commitment and Contingencies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Sublease income	$ 3,400,000	$ 3,200,000	$ 9,800,000	$ 9,600,000
Cost of matching contributions	0	$ 0	0	$ 0
Letters of credit outstanding	$ 17,000,000		$ 17,000,000