Operating Leases - Schedule of Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Assets
Operating lease right-of-use assets	$ 68,608
Liabilities:
Accrued expenses and other current liabilities	7,675	$ 0
Operating lease liabilities, noncurrent	64,792
Total operating lease liabilities	$ 72,467