Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Changes in operating assets and liabilities:
Accounts receivable	$ (5,361)	$ 16,847	$ 4,699
Inventories	1,215	7,564	6,753
Prepaid expenses and other assets	228	(111)	195
Accounts payable	2,558	(5,059)	(3,578)
Accrued and other liabilities	7,279	(8,985)	48
Customer advances	1,126	(368)	(144)
Other operating activities, net	7,045	9,888	7,973
Cash paid during the year for income taxes	6,618	6,558	14,011
Interest Paid	190	129	160
Significant non-cash transactions:
Issuance of common stock for business acquisition	0	0	39,252
Capital Expenditures Incurred but Not yet Paid	84	161	564
Capital expenditures converted from inventory	$ 0	$ 1,036	$ 491