Commitment and Contingencies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Cash payments (receipts) included in the measurement of operating lease liabilities – operating cash flows	$ 31,281	$ 13,458	$ 2,537
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities	$ 11,506	$ 194,712	$ 10,737