Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
OPERATING ACTIVITIES:
Net income	$ 34,624	$ 41,453
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,264	9,595
Gain on acquisition-related contingent liability settlement	0	(508)
Change in fair value of acquisition-related contingent consideration	382	706
Loss from equity investment	114	72
Deferred income taxes	(1,202)	(1,067)
Share-based compensation expense	3,289	2,387
Change in operating assets and liabilities:
Accounts receivable	(7,753)	5,202
Inventories	(5,251)	4,735
Prepaid expense and other assets	(819)	42
Operating liabilities	2,852	(4,960)
Other operating activities, net	703	389
Net cash provided by operating activities	37,203	58,046
INVESTING ACTIVITIES:
Capital expenditures	(23,906)	(22,840)
Other investing activities, net	(613)	(125)
Net cash used in investing activities	(24,519)	(22,965)
FINANCING ACTIVITIES:
Dividends paid	(13,094)	(11,430)
Payments of acquisition-related contingent liability	(353)	(1,867)
Other financing activities, net	145	471
Net cash used in financing activities	(13,302)	(12,826)
Effect of exchange rate changes on cash	(87)	(10)
Net increase in cash and cash equivalents	(705)	22,245
Cash and cash equivalents at beginning of year	49,353	25,842
Cash and cash equivalents at end of period	$ 48,648	$ 48,087