Leases - Schedule of Lease Cost Included In Operating Expenses in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Finance lease cost:
Amortization of finance lease right-of-use assets		$ 14,102	$ 11,713	$ 41,027	$ 29,823
Interest on finance lease liabilities		1,416	1,312	4,440	2,987
Operating lease cost, gross		13,552	12,300	40,095	36,533
Variable lease cost, gross		2,180	3,040	7,074	8,741
Sublease income		(2,707)	(2,741)	(7,888)	(8,327)
Total lease cost	[1]	$ 28,543	$ 25,624	$ 84,748	$ 69,757

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