Income Taxes - Significant components of the company's income tax provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	$ 3,401	$ 6,910	$ 17,057
Current State and Local Tax Expense (Benefit)	416	1,099	1,549
Current Foreign Tax Expense (Benefit)	98	735	148
Currentl tax expense	3,915	8,744	18,754
Deferred Federal Income Tax Expense (Benefit)	1,271	1,018	(613)
Deferred State and Local Income Tax Expense (Benefit)	204	73	(13)
Deferred Foreign Income Tax Expense (Benefit)	31	(138)	(161)
Deferred expense (benefit)	1,506	953	(787)
Income tax expense	$ 5,421	$ 9,697	$ 17,967