Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Operating Leases
Lease right-of-use-assets	$ 46,923	$ 49,132
Lease liabilities	9,114	8,960
Lease liabilities, noncurrent	42,344	44,453
Total operating lease liabilities	51,458	53,413
Finance Leases
Property and equipment, at cost	1,674	1,761
Accumulated depreciation	(1,569)	(1,320)
Property and equipment, net	105	441
Lease liabilities	1,013	1,054
Lease liabilities, noncurrent	86	362
Total finance lease liabilities	$ 1,099	$ 1,416
Weighted Average Remaining Lease Term
Operating leases	7 years	7 years 1 month 6 days
Finance leases	1 year 1 month 6 days	1 year 3 months 18 days
Weighted Average Discount Rate
Operating leases	4.20%	4.30%
Finance leases	4.30%	4.30%