Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
OPERATING ACTIVITIES:
Net income	$ 52,555	$ 50,635	$ 40,537
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	11,496	8,180	6,512
Amortization of intangible assets	1,602	1,088	1,119
Gain on disposition of assets	0	0	(451)
Gain on acquisition-related contingent liability settlement	(508)	0	0
Change in fair value of acquisition-related contingent consideration	784	(14)	274
Income from equity investment	(156)	(156)	(195)
Deferred income taxes	(1,803)	5,358	423
Share-based compensation expense	3,075	1,922	1,179
Change in operating assets and liabilities	9,199	(23,076)	(7,273)
Other operating activities, net	212	(106)	(40)
Net cash provided by operating activities	76,456	43,831	42,085
INVESTING ACTIVITIES:
Capital expenditures	(29,675)	(29,015)	(13,972)
Payments related to business acquisitions, net of cash acquired	0	(11,787)	(399)
Sales of short-term investments	0	1,000	3,700
Purchases of short-term investments	0	0	(1,700)
Proceeds from disposition of assets	0	0	888
Other investing activities, net	(255)	(511)	65
Net cash used in investing activities	(29,930)	(40,313)	(11,418)
FINANCING ACTIVITIES:
Dividends paid	(15,244)	(13,025)	(34,095)
Repayment of line of credit	0	(2,869)	0
Payment of acquisition related contingent liabilities	(8,367)	0	0
Other financing activities, net	604	660	261
Net cash used in financing activities	(23,007)	(15,234)	(33,834)
Effect of exchange rate changes on cash	(8)	(5)	46
Net increase (decrease) in cash and cash equivalents	23,511	(11,721)	(3,121)
Cash and cash equivalents at beginning of year	25,842	37,563	40,684
Cash and cash equivalents at end of year	$ 49,353	$ 25,842	$ 37,563