Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Changes in operating assets and liabilities:
Accounts receivable	$ (7,014)	$ (5,361)	$ 16,847
Inventories	(11,062)	1,215	7,564
Prepaid expenses and other assets	(2,445)	228	(111)
Accounts payable	1,280	2,558	(5,059)
Accrued and other liabilities	2,560	8,405	(9,353)
Change in operating assets and liabilities, net	(16,681)	7,045	9,888
Cash paid during the year for income taxes	19,854	6,618	6,558
Interest Paid	186	190	129
Significant non-cash transactions:
Capital expenditures incurred but not yet paid	418	84	161
Assets acquired under capital leases	79	0	0
Capital expenditures converted from inventory	$ 0	$ 0	$ 1,036