Operating Leases - Schedule of Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Assets
Operating lease right-of-use assets	$ 53,308
Liabilities:
Accrued expenses and other current liabilities	5,725	$ 0
Operating lease liabilities, noncurrent	50,132
Total operating lease liabilities	$ 55,857