Income Taxes (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2019 USD ($) percentagepoints	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)
Income Tax Contingency [Line Items]
Federal statutory rate - expected rate first year after TCJA effective	21.00%
Effective tax rate change, excluding discrete items | percentagepoints	10
Impact of TCJA, excluding discrete items	$ 6,218
Effective tax rate change, including discrete items | percentagepoints	15
Tax savings from TCJA, including discrete items	$ 9,112
Total unrecognized tax benefits that, if recognized, would affect the company's effective tax rate	2,183	$ 2,143	$ 1,806
Accrued interest and penalties related to unrecognized tax benefits	442	$ 418	$ 500
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	0
United States
Income Tax Contingency [Line Items]
Pre-tax book income, domestic	59,774
Foreign Tax Authority
Income Tax Contingency [Line Items]
Pre-tax book income, foreign	$ 1,796