Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
OPERATING ACTIVITIES:
Net income	$ 18,781	$ 22,331
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,373	6,653
Change in fair value of acquisition-related contingent consideration	363	283
Loss from equity investment	57	111
Deferred income taxes	(1,769)	(246)
Share-based compensation expense	2,428	2,276
Change in operating assets and liabilities:
Accounts receivable	4,383	7,024
Inventories	3,967	(8,197)
Prepaid expense and other assets	(1,689)	(1,439)
Operating liabilities	(3,863)	894
Other operating activities, net	7	47
Net cash provided by operating activities	31,038	29,737
INVESTING ACTIVITIES:
Capital expenditures	(7,297)	(13,746)
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	(432)	(534)
Net cash used in investing activities	(12,440)	(14,280)
FINANCING ACTIVITIES:
Dividends paid	8,826	8,727
Payments of acquistion-related debt	(638)	0
Payments of acquisition-related contingent liability	(454)	(353)
Employee stock option exercises and other financing activities, net	511	45
Net cash used in financing activities	(9,407)	(9,035)
Effect of exchange rate changes on cash	(17)	(58)
Net increase in cash and cash equivalents	9,174	6,364
Cash and cash equivalents at beginning of year	52,987	49,353
Cash and cash equivalents at end of period	$ 62,161	$ 55,717