CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Mar. 31, 2013	$ 121,019	$ 55,133	$ 42	$ 176,194
Balance (in shares) at Mar. 31, 2013	22,120,000
Increase (Decrease) in Stockholders' Equity
Common stock issued under stock option exercises	$ 1,455	0	0	1,455
Common stock issued under stock option exercises (in shares)	70,000
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes	$ (4,683)	0	0	(4,683)
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes (in shares)	204,000
Repurchases of common stock, net	$ (2,981)	0	0	(2,981)
Repurchases of common stock, net (in shares)	(86,000)
Dividends to shareholders				0
Share-based compensation	$ 7,629	0	0	7,629
Excess tax benefits from share-based awards and other tax adjustments	2,164	0	0	2,164
Net income	0	14,185	0	14,185
Other comprehensive income (loss), net of tax	0	0	(47)	(47)
Balance at Mar. 31, 2014	$ 124,603	69,318	(5)	193,916
Balance (in shares) at Mar. 31, 2014	22,308,000
Increase (Decrease) in Stockholders' Equity
Common stock issued under stock option exercises	$ 31	0	0	31
Common stock issued under stock option exercises (in shares)	2,000
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes	$ (3,026)	0	0	(3,026)
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes (in shares)	203,000
Warrant exercises	$ 78	0	0	78
Warrants exercises (in shares)	26,000
Dividends to shareholders	$ 0	(9,006)	0	(9,006)
Share-based compensation	9,759	0	0	9,759
Compensation expense recognized on accelerated vesting of warrants	168	0	0	168
Excess tax benefits from share-based awards and other tax adjustments	946	0	0	946
Net income	0	27,331	0	27,331
Other comprehensive income (loss), net of tax	0	0	(3)	(3)
Balance at Mar. 31, 2015	$ 132,559	87,643	(8)	220,194
Balance (in shares) at Mar. 31, 2015	22,539,000
Increase (Decrease) in Stockholders' Equity
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes	$ (5,250)	0	0	(5,250)
Common stock issued in settlement of restricted stock units, net of shares withheld for employee taxes (in shares)	190,000
Warrant exercises	$ 12	0	0	12
Warrants exercises (in shares)	4,000
Repurchases of common stock, net	$ (13,040)	0	0	(13,040)
Repurchases of common stock, net (in shares)	(325,000)
Dividends to shareholders	$ 0	(9,970)	0	(9,970)
Share-based compensation	11,114	0	0	11,114
Excess tax benefits from share-based awards and other tax adjustments	1,621	0	0	1,621
Net income	0	31,630	0	31,630
Other comprehensive income (loss), net of tax	0	0	1	1
Balance at Mar. 31, 2016	$ 127,016	$ 109,303	$ (7)	$ 236,312
Balance (in shares) at Mar. 31, 2016	22,408,000