INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2013	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of unrecognized tax benefits [Roll Forward]
Beginning balance				$ 72					$ 72	$ 149
Reductions to uncertain tax positions									0	(77)
Ending balance	$ 72				$ 72				72	72	$ 149
Unrecognized tax benefits that would impact effective tax rate	104				101				104	101
Interest on income taxes expense included in statement of operation									4	4
Accrued interest on income taxes	48				43				$ 48	$ 43
Reconciliation of income taxes to the statutory rate [Abstract]
Statutory federal income tax rate									35.00%	35.00%	35.00%
Income tax expense computed at the U.S. statutory federal rate									$ 26,513	$ 27,410	$ 21,040
State income tax expense - net of federal benefit									3,544	4,193	3,080
Non-deductible executive compensation									331	222	248
Other									616	648	457
Provision for income taxes	6,422	$ 7,348	$ 10,982	6,252	6,170	$ 11,230	$ 8,374	$ 6,699	$ 31,004	$ 32,473	$ 24,825
Effective income tax rate									40.90%	41.50%	41.30%
Current [Abstract]
Federal									$ 21,361	$ 27,665	$ 23,313
State									6,114	6,667	5,033
Foreign									13	3	15
Total current expense									27,488	34,335	28,361
Deferred [Abstract]
Federal									3,727	(1,591)	(3,274)
State									(211)	(271)	(262)
Total deferred expense (benefit)									3,516	(1,862)	(3,536)
Provision for income taxes	6,422	$ 7,348	$ 10,982	$ 6,252	6,170	$ 11,230	$ 8,374	$ 6,699	31,004	32,473	$ 24,825
Deferred Tax Assets [Abstract]
Accrued vacation	2,116				1,955				2,116	1,955
Deferred compensation	0				89				0	89
Deferred revenue	1,046				369				1,046	369
Foreign net operating loss carryforward	461				0				461	0
Reserve for credit losses	1,929				2,066				1,929	2,066
Restricted stock	1,778				1,431				1,778	1,431
Other credits and carryforwards	1,275				1,235				1,275	1,235
Other accruals and reserves	1,556				687				1,556	687
Gross deferred tax assets	10,161				7,832				10,161	7,832
Less: valuation allowance	(1,270)				(1,223)				(1,270)	(1,223)
Net deferred tax assets	8,891				6,609				8,891	6,609
Deferred Tax Liabilities [Abstract]
Basis difference in fixed assets	(1,170)				(1,238)				(1,170)	(1,238)
Basis difference in operating lease items	(7,749)				(2,356)				(7,749)	(2,356)
Basis difference in tax deductible goodwill	(2,973)				(2,411)				(2,973)	(2,411)
Total deferred tax liabilities	(11,892)				(6,005)				(11,892)	(6,005)
Net deferred tax (liabilities) assets	(3,001)								(3,001)
Net deferred tax (liabilities) assets					$ 604					$ 604
State [Member]
Operating Loss Carryforwards [Line Items]
Capital loss carryforwards	1,300								$ 1,300
Capital loss carryforwards expiration term									5 years
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 500								$ 500