Property and Equipment, Net - Narrative (Details) - USD ($)	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 10,969,000	$ 10,687,000	$ 7,194,000
Property and equipment purchased under finance lease		14,200,000
Accumulated depreciation		10,200,000
Depreciation expense on finance leases	$ 3,100,000	$ 4,300,000
Depreciation expense on capital leases			$ 3,600,000