Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
OPERATING ACTIVITIES:
Net income	$ 11,034	$ 13,994
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,115	3,170
Change in fair value of acquisition-related contingent consideration	155	139
Loss from equity investment	19	25
Deferred income taxes	(1,046)	(133)
Share-based compensation expense	991	829
Change in operating assets and liabilities:
Accounts receivable	(579)	(2,973)
Inventories	(188)	(2,852)
Prepaid expense and other assets	(1,947)	(1,870)
Operating liabilities	5,613	4,558
Other operating activities, net	11	12
Net cash provided by operating activities	18,178	14,899
INVESTING ACTIVITIES:
Capital expenditures	(2,900)	(8,149)
Other investing activities, net	(112)	(263)
Net cash used in investing activities	(3,012)	(8,412)
FINANCING ACTIVITIES:
Dividends paid	(4,371)	(4,361)
Payments of acquisition-related contingent liability	(454)	(353)
Other financing activities, net	30	7
Net cash used in financing activities	(4,795)	(4,707)
Effect of exchange rate changes on cash	44	(28)
Net increase in cash and cash equivalents	10,415	1,752
Cash and cash equivalents at beginning of year	52,987	49,353
Cash and cash equivalents at end of period	$ 63,402	$ 51,105