Leases - Schedule of Lease Cost Included In Operating Expenses in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2021	Apr. 30, 2020
Finance lease cost:
Amortization of finance lease right-of-use assets		$ 13,082	$ 13,106
Interest on finance lease liabilities		1,171	1,526
Operating lease cost, gross		13,780	13,117
Variable lease cost, gross		2,302	2,724
Sublease income		(3,194)	(2,808)
Total lease cost	[1]	$ 27,141	$ 27,665

[1] Short-term lease cost was not material for the periods presented and is not included in the table above.