Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	Oct. 23, 2019	Jun. 06, 2019	Jan. 31, 2020	Jan. 31, 2019
Commitments And Contingencies [Line Items]
Purchase obligation			$ 237,237
Purchase obligation, due to be paid in 2021			18,733
Purchase obligation, due to be paid in 2022			15,376
Purchase obligation, due to be paid in 2023			36,026
Purported Securities Class Action
Commitments And Contingencies [Line Items]
Complaint dismissal date		Dec. 16, 2019
Shareholder Derivative Complaint
Commitments And Contingencies [Line Items]
Complaint dismissal date	Dec. 26, 2019
Accrued Expenses and Other Current Liabilities and Other Long Term Liabilities
Commitments And Contingencies [Line Items]
Purchase obligation			10,600
Purchase obligation, due to be paid in 2021			2,200
Purchase obligation, due to be paid in 2022			3,100
Purchase obligation, due to be paid in 2023			5,300
November 2017 Facility | Wells Fargo Bank | Secured Debt | Letters of Credit
Commitments And Contingencies [Line Items]
Letters of credit facility			$ 26,500	$ 26,500