UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Sales of product and services	$ 261,283	$ 250,178	$ 508,320	$ 484,460
Financing revenue	8,001	7,413	18,761	15,313
Fee and other income	1,845	2,460	3,365	5,002
TOTAL REVENUES	271,129	260,051	530,446	504,775
COSTS AND EXPENSES
Cost of sales, product and services	214,854	205,199	418,184	399,590
Direct lease costs	3,495	2,461	6,748	4,704
Total cost of sales	218,349	207,660	424,932	404,294
Professional and other fees	1,908	2,707	5,146	5,820
Salaries and benefits	29,685	26,919	60,367	53,273
General and administrative expenses	6,059	5,411	11,060	10,066
Interest and financing costs	433	446	893	851
Total expenses	38,085	35,483	77,466	70,010
TOTAL COSTS AND EXPENSES	256,434	243,143	502,398	474,304
EARNINGS BEFORE PROVISION FOR INCOME TAXES	14,695	16,908	28,048	30,471
PROVISION FOR INCOME TAXES	6,104	6,875	11,607	12,376
NET EARNINGS	$ 8,591	$ 10,033	$ 16,441	$ 18,095
NET EARNINGS PER COMMON SHARE-BASIC (In dollars per share)	$ 1.07	$ 1.26	$ 2.05	$ 2.27
NET EARNINGS PER COMMON SHARE-DILUTED (In dollars per share)	$ 1.06	$ 1.25	$ 2.03	$ 2.25
WEIGHTED AVERAGE SHARES OUTSTANDING-BASIC (In shares)	7,975,590	7,770,206	7,944,932	7,745,506
WEIGHTED AVERAGE SHARES OUTSTANDING-DILUTED (In shares)	8,019,557	7,847,227	8,006,572	7,822,079