Restructuring Provision - Summary of Rollforward of Provision Related Corporate Initiatives, Including Provision Associated with Restructuring Plan (Parenthetical) (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020	Oct. 31, 2019
Restructuring Cost And Reserve [Line Items]
Accrued payroll and benefits	$ 12,693	$ 6,302	$ 9,353
Capital in excess of par value	212,730	$ 208,473	$ 206,725
Severance and Employee Related
Restructuring Cost And Reserve [Line Items]
Accrued payroll and benefits	2,800
Capital in excess of par value	$ 400