Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
OPERATING ACTIVITIES:
Net income	$ 28,177	$ 21,298
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,159	3,594
Change in fair value of acquisition-related contingent consideration	(93)	352
Deferred income taxes	1,352	(753)
Share-based compensation expense	984	567
Change in operating assets and liabilities:
Accounts receivable	(3,192)	(280)
Inventories	(6,546)	(10,712)
Prepaid expenses and other assets	(932)	(594)
Operating liabilities	2,427	6,464
Other operating activities, net	(73)	(120)
Net cash provided by operating activities	26,263	19,816
INVESTING ACTIVITIES:
Capital expenditures	(11,000)	(3,774)
Purchase of short-term investments	0	(1,700)
Sale of short-term investments	1,000	2,200
Payments related to business acquisitions	(52)	(383)
Other investing activities, net	(449)	75
Net cash used in investing activities	(10,501)	(3,582)
FINANCING ACTIVITIES:
Dividends paid	(6,509)	(5,771)
Other financing activities, net	62	(36)
Net cash used in financing activities	(6,447)	(5,807)
Effect of exchange rate changes on cash	100	4
Net increase in cash and cash equivalents	9,415	10,431
Cash and cash equivalents:
Beginning of period	37,563	40,684
End of period	$ 46,978	$ 51,115