UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Sales of product and services	$ 286,584	$ 261,283	$ 547,940	$ 508,320
Financing revenue	9,059	8,001	17,933	18,761
Fee and other income	1,829	1,845	3,903	3,365
TOTAL REVENUES	297,472	271,129	569,776	530,446
Cost of sales, product and services	230,742	214,854	443,650	418,184
Direct lease costs	2,806	3,495	5,763	6,748
Cost of revenues	233,548	218,349	449,413	424,932
Professional and other fees	1,577	1,908	3,410	5,146
Salaries and benefits	34,252	29,685	67,199	60,367
General and administrative expenses	7,158	6,059	13,431	11,060
Interest and financing costs	611	433	1,255	893
Operating expenses	43,598	38,085	85,295	77,466
OPERATING INCOME	20,326	14,695	35,068	28,048
Other income	0	0	1,434	0
EARNINGS BEFORE PROVISION FOR INCOME TAXES	20,326	14,695	36,502	28,048
PROVISION FOR INCOME TAXES	8,374	6,104	15,073	11,607
NET EARNINGS	$ 11,952	$ 8,591	$ 21,429	$ 16,441
NET EARNINGS PER COMMON SHARE-BASIC (In dollars per share)	$ 1.63	$ 1.07	$ 2.88	$ 2.05
NET EARNINGS PER COMMON SHARE-DILUTED (In dollars per share)	$ 1.63	$ 1.06	$ 2.86	$ 2.03
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING-BASIC (In shares)	7,320	7,976	7,412	7,945
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING-DILUTED (In shares)	7,345	8,020	7,461	8,007