Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Mar. 31, 2013	$ 307,049	$ 595	$ 179,743	$ 126,722	$ (11)
Beginning Balance, Shares at Mar. 31, 2013		59,543,000
Exercise of stock options and vesting of restricted stock	$ 2,201	$ 2	2,199
Exercise of stock options and vesting of restricted stock, Shares	111,272	167,000
Common stock issuance for earnout settlement	$ 1,376	$ 1	1,375
Common stock issuance for earnout settlement, Shares		62,000
Common stock issuance for acquisitions	9,273	$ 4	9,269
Common stock issuance for acquisitions, Shares		434,000
Tax deficiency resulting from exercise of stock options	(337)		(337)
Stock-based compensation	2,490		2,490
Dividends declared	(42,471)			(42,471)
Components of other comprehensive loss:
Unrealized gain (loss) on marketable securities	(64)				(64)
Translation adjustments	(107)				(107)
Net income	15,680			15,680
Ending Balance at Mar. 31, 2014	295,090	$ 602	194,739	99,931	(182)
Ending Balance, Shares at Mar. 31, 2014		60,206,000
Exercise of stock options and vesting of restricted stock	384	$ 1	383
Exercise of stock options and vesting of restricted stock, Shares		79,000
Common stock issuance for earnout settlement	284	$ 0	284
Common stock issuance for earnout settlement, Shares		18,000
Tax deficiency resulting from exercise of stock options	(228)		(228)
Stock-based compensation	3,472		3,472
Dividends declared	(42,784)			(42,784)
Components of other comprehensive loss:
Unrealized gain (loss) on marketable securities	107				107
Translation adjustments	(117)				(117)
Net income	27,332			27,332
Ending Balance at Mar. 31, 2015	283,540	$ 603	198,650	84,479	(192)
Ending Balance, Shares at Mar. 31, 2015		60,303,000
Exercise of stock options and vesting of restricted stock	$ 992	$ 3	989
Exercise of stock options and vesting of restricted stock, Shares	800	241,000
Common stock issuance for earnout settlement	$ 9,273	$ 4	9,269
Common stock issuance for earnout settlement, Shares		434,000
Tax deficiency resulting from exercise of stock options	(941)		(941)
Stock-based compensation	3,295		3,295
Dividends declared	(32,150)			(32,150)
Components of other comprehensive loss:
Unrealized gain (loss) on marketable securities	93				93
Translation adjustments	(382)				(382)
Net income	5,657			5,657
Ending Balance at Mar. 31, 2016	$ 269,377	$ 610	$ 211,262	$ 57,986	$ (481)
Ending Balance, Shares at Mar. 31, 2016		60,978,000