Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Changes in operating assets and liabilities:
Accounts receivable	$ 3,938	$ (7,014)	$ (5,361)
Inventories	1,092	(11,062)	1,215
Prepaid expenses and other assets	(2,440)	(2,445)	228
Accounts payable	(4,517)	1,280	2,558
Accrued and other liabilities	3,480	2,560	8,405
Change in operating assets and liabilities, net	1,553	(16,681)	7,045
Cash paid during the year for income taxes	8,225	19,854	6,618
Interest paid	227	186	190
Significant non-cash transactions:
Capital expenditures and other intangibles included in accounts payable	655	418	84
Assets acquired under capital leases	$ 38	$ 79	$ 0