Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Changes in operating assets and liabilities:
Accounts receivable	$ 16,847	$ 4,699	$ 1,297
Inventories	7,516	6,753	(9,190)
Prepaid expenses and other assets	(111)	195	(239)
Accounts payable	(5,059)	(3,578)	(994)
Accrued and other liabilities	(8,978)	48	(1,150)
Customer advances	(368)	(144)	(173)
Other operating activities, net	9,847	7,973	(10,449)
Cash paid during the year for income taxes	6,558	14,011	20,002
Interest Paid	129	160	0
Significant non-cash transactions:
Issuance of common stock for business acquisition	0	39,252	0
Capital Expenditures Incurred but Not yet Paid	161	564	1,083
Capital expenditures converted from inventory	$ 1,036	$ 491	$ 418