Revenue from Contracts with Customers - Contract Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Disaggregation of Revenue [Line Items]
Total contract liabilities	$ 554,712	$ 526,042	$ 249,950
Deferred Revenue
Disaggregation of Revenue [Line Items]
Contract with customer, liability, current	460,561	390,965
Contract with customer, liability, noncurrent	81,116	116,604
Other
Disaggregation of Revenue [Line Items]
Contract with customer, liability, current	12,225	17,177
Contract with customer, liability, noncurrent	$ 810	$ 1,296