Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
OPERATING ACTIVITIES:
Net income	$ 25,578	$ 34,624
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,538	10,264
Change in fair value of acquisition-related contingent consideration	514	382
Loss from equity investment	138	114
Deferred income taxes	(2,420)	(1,202)
Share-based compensation expense	3,336	3,289
Change in operating assets and liabilities:
Accounts receivable	2,108	(7,753)
Inventories	2,768	(5,251)
Other assets	(555)	(819)
Operating liabilities	1,623	2,852
Other operating activities, net	67	703
Net cash provided by operating activities	45,695	37,203
INVESTING ACTIVITIES:
Capital expenditures	(12,797)	(23,906)
Payments related to business acquisitions, net of cash acquired	4,711	0
Proceeds from sales of short-term investments	250	0
Purchase of short-term investments	(250)	0
Other investing activities, net	(604)	(613)
Net cash used in investing activities	(18,112)	(24,519)
FINANCING ACTIVITIES:
Dividends paid	13,572	13,094
Payments of acquistion-related debt	(648)	0
Payments of acquisition-related contingent liability	(491)	(353)
Employee stock option exercises and other financing activities, net	665	145
Net cash used in financing activities	(14,046)	(13,302)
Effect of exchange rate changes on cash	(166)	(87)
Net increase in cash and cash equivalents	13,371	(705)
Cash and cash equivalents at beginning of year	52,987	49,353
Cash and cash equivalents at end of period	$ 66,358	$ 48,648