Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
OPERATING ACTIVITIES:
Net income	$ 50,635	$ 40,537	$ 28,574
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	8,180	6,512	6,611
Amortization of intangible assets	1,088	1,119	497
Gain on disposition of assets	0	(451)	0
Change in fair value of acquisition-related contingent consideration	(14)	274	94
Earnings of equity investee	(156)	(195)	(10)
Deferred income taxes	5,358	423	95
Share-based compensation expense	1,922	1,179	1,034
Change in operating assets and liabilities	(23,076)	(7,273)	10,935
Other operating activities, net	(106)	(40)	(187)
Net cash provided by operating activities	43,831	42,085	47,643
INVESTING ACTIVITIES:
Capital expenditures	(29,015)	(13,972)	(3,302)
Payments related to business acquisitions, net of cash acquired	(11,787)	(399)	(2,000)
Sales of short-term investments	1,000	3,700	500
Purchases of short-term investments	0	(1,700)	(3,500)
Purchase of equity investment	0	0	(5,000)
Proceeds from disposition of assets	0	888	0
Other investing activities, net	(511)	65	(94)
Net cash used in investing activities	(40,313)	(11,418)	(13,396)
FINANCING ACTIVITIES:
Dividends paid	(13,025)	(34,095)	(9,911)
Repayment of line of credit	(2,869)	0	0
Other financing activities, net	660	261	44
Net cash used in financing activities	(15,234)	(33,834)	(9,867)
Effect of exchange rate changes on cash	(5)	46	37
Net increase (decrease) in cash and cash equivalents	(11,721)	(3,121)	24,417
Cash and cash equivalents at beginning of year	37,563	40,684	16,267
Cash and cash equivalents at end of year	$ 25,842	$ 37,563	$ 40,684