Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Changes in operating assets and liabilities:
Accounts receivable	$ 1,297	$ 4,362	$ (15,569)
Inventories	(9,190)	8,567	(11,528)
Prepaid expenses and other assets	(239)	976	(291)
Accounts payable	(994)	(2,937)	(233)
Accrued and other liabilities	(1,150)	(1,709)	4,578
Customer advances	(173)	(60)	(33)
Other operating activites, net	(10,449)	9,199	(23,076)
Cash paid during the year for income taxes	20,002	26,697	16,782
Significant non-cash transactions:
Capital expenditures included in accounts payable	$ 1,083	$ 2,196	$ 984