Revenue from Contracts with Customers - Summary of Contract Liabilities Balances (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Disaggregation of Revenue [Line Items]
Total contract liabilities	$ 514,722	$ 554,712
Deferred revenue
Disaggregation of Revenue [Line Items]
Contract with customer, liability, current	427,475	460,561
Deferred revenue, non-current	75,519	81,926
Other contract liabilities
Disaggregation of Revenue [Line Items]
Contract with customer, liability, current	$ 11,728	$ 12,225