Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
OPERATING ACTIVITIES:
Net income	$ 42,902	$ 52,555	$ 50,635
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,449	11,496	8,180
Amortization of intangible assets	1,746	1,602	1,088
Gain on acquisition-related contingent liability settlement	0	(508)	0
Change in fair value of acquisition-related contingent consideration	540	784	(14)
Income from equity investment	(116)	(156)	(156)
Deferred income taxes	623	(1,803)	5,358
Share-based compensation expense	4,198	3,075	1,922
Change in operating assets and liabilities	(10,449)	9,199	(23,076)
Other operating activities, net	943	212	(106)
Net cash provided by operating activities	52,836	76,456	43,831
INVESTING ACTIVITIES:
Capital expenditures	(30,701)	(29,675)	(29,015)
Payments related to business acquisitions, net of cash acquired	0	0	(11,787)
Sales of short-term investments	0	0	1,000
Purchases of short-term investments	(250)	0	0
Other investing activities, net	(664)	(255)	(511)
Net cash used in investing activities	(31,615)	(29,930)	(40,313)
FINANCING ACTIVITIES:
Dividends paid	(17,465)	(15,244)	(13,025)
Repayment of line of credit	0	0	(2,869)
Payment of acquisition related contingent liabilities	(353)	(8,367)	0
Other financing activities, net	464	604	660
Net cash used in financing activities	(17,354)	(23,007)	(15,234)
Effect of exchange rate changes on cash	(233)	(8)	(5)
Net increase (decrease) in cash and cash equivalents	3,634	23,511	(11,721)
Cash and cash equivalents at beginning of year	49,353	25,842	37,563
Cash and cash equivalents at end of year	$ 52,987	$ 49,353	$ 25,842