Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
OPERATING ACTIVITIES:
Net income	$ 22,331	$ 30,591
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,653	6,036
Gain on acquisition-related contingent liability settlement	0	(508)
Change in fair value of acquisition-related contingent consideration	283	508
Loss from equity investment	111	57
Deferred income taxes	(246)	(590)
Share-based compensation expense	2,276	1,570
Change in operating assets and liabilities:
Accounts receivable	7,024	10,798
Inventories	(8,197)	4,368
Prepaid expense and other assets	(1,439)	(990)
Operating liabilities	894	(7,407)
Other operating activities, net	47	29
Net cash provided by operating activities	29,737	44,462
INVESTING ACTIVITIES:
Capital expenditures	(13,746)	(16,870)
Other investing activities, net	(534)	22
Net cash used in investing activities	(14,280)	(16,848)
FINANCING ACTIVITIES:
Dividends paid	(8,727)	(7,618)
Payments of acquisition-related contingent liability	(353)	(1,867)
Other financing activities, net	45	163
Net cash used in financing activities	(9,035)	(9,322)
Effect of exchange rate changes on cash	(58)	(21)
Net increase in cash and cash equivalents	6,364	18,271
Cash and cash equivalents at beginning of year	49,353	25,842
Cash and cash equivalents at end of period	$ 55,717	$ 44,113