Income Taxes - Significant components of the company's income tax provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	$ 6,910	$ 17,057	$ 6,375
Current State and Local Tax Expense (Benefit)	1,099	1,549	591
Current Foreign Tax Expense (Benefit)	735	148	388
Currentl tax expense	8,744	18,754	7,354
Deferred Federal Income Tax Expense (Benefit)	1,018	(613)	330
Deferred State and Local Income Tax Expense (Benefit)	73	(13)	14
Deferred Foreign Income Tax Expense (Benefit)	(138)	(161)	(37)
Deferred expense (benefit)	953	(787)	307
Income tax expense	$ 9,697	$ 17,967	$ 7,661