Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Mar. 31, 2012	$ 295,177	$ 592	$ 169,033	$ 125,597	$ (45)
Beginning Balance, Shares at Mar. 31, 2012		59,180,000
Exercise of stock options and vesting of restricted stock	948	1	947
Exercise of stock options and vesting of restricted stock, Shares	56,366	83,000
Common stock issuance for earnout settlement	3,000	1	2,999
Common stock issuance for earnout settlement, Shares		165,000
Common stock issuance for acquisitions	4,595	1	4,594
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(157)		(157)
Common stock issuance for acquisitions, Shares		115,000
Stock-based compensation	2,327		2,327
Dividends declared	(41,599)			(41,599)
Unrealized loss on AFS securities	0
Translation adjustments	34				34
Net income	42,724			42,724
Ending Balance at Mar. 31, 2013	307,049	595	179,743	126,722	(11)
Ending 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
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(337)		(337)
Common stock issuance for acquisitions, Shares		434,000
Stock-based compensation	2,490		2,490
Dividends declared	(42,471)			(42,471)
Unrealized loss on AFS 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
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(228)		(228)
Stock-based compensation	3,472		3,472
Dividends declared	(42,784)			(42,784)
Unrealized loss on AFS 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