Commitment and Contingencies - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021	May 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Lessee, operating lease, modified lease, undiscounted amount					$ 68,000,000
Increase in operating lease right of use assets and operating lease liabilities upon modification of existing lease	$ 30,000,000
Sublease income	3,300,000	$ 3,200,000	$ 6,600,000	$ 6,400,000
Lessee, Lease, lease not yet commenced, undiscounted amount	16,000,000		$ 16,000,000
Lessee, lease, lease not yet commenced, term of contract (in years)			10 years
Cost of matching contributions	0	$ 0	$ 0	$ 0
Letters of credit outstanding	$ 17,100,000		$ 17,100,000