CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance at Mar. 31, 2010	$ 125,050	$ 22,069	$ 0	$ 147,119
Balance (in shares) at Mar. 31, 2010	22,112,000
Increase (Decrease) in Stockholders' Equity
Common stock issued under stock option exercises	1,684	0	0	1,684
Common stock issued under stock option exercises (in shares)	314,000
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes	(2,013)	0	0	(2,013)
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes (in shares)	161,000
Share-based compensation	4,857	0	0	4,857
Excess tax benefits from share-based awards and other tax adjustments	2,215	0	0	2,215
Warrants issued for intangible assets	249	0	0	249
Net income	0	14,537	0	14,537
Other comprehensive income, net of tax				0
Balance at Mar. 31, 2011	132,042	36,606	0	168,648
Balance (in shares) at Mar. 31, 2011	22,587,000
Increase (Decrease) in Stockholders' Equity
Common stock issued under stock option exercises	615	0	0	615
Common stock issued under stock option exercises (in shares)	122,000
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes	(2,211)	0	0	(2,211)
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes (in shares)	158,000
Repurchases of common stock, net	(27,328)	0	0	(27,328)
Repurchases of common stock, net (in shares)	(1,168,000)			(1,200,000)
Share-based compensation	5,715	0	0	5,715
Excess tax benefits from share-based awards and other tax adjustments	842	0	0	842
Warrants issued for intangible assets	388	0	0	388
Net income	0	13,091	0	13,091
Other comprehensive income, net of tax	0	0	25	25
Balance at Mar. 31, 2012	110,063	49,697	25	159,785
Balance (in shares) at Mar. 31, 2012	21,699,000
Increase (Decrease) in Stockholders' Equity
Common stock issued under stock option exercises	2,800	0	0	2,800
Common stock issued under stock option exercises (in shares)	210,000
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes	(1,625)	0	0	(1,625)
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes (in shares)	211,000
Repurchases of common stock, net (in shares)				0
Dividends to shareholders	0	(22,023)	0	(22,023)
Share-based compensation	7,098	0	0	7,098
Excess tax benefits from share-based awards and other tax adjustments	2,683	0	0	2,683
Warrants issued for intangible assets				0
Net income	0	27,459	0	27,459
Other comprehensive income, net of tax	0	0	17	17
Balance at Mar. 31, 2013	$ 121,019	$ 55,133	$ 42	$ 176,194
Balance (in shares) at Mar. 31, 2013	22,120,000