UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011		Sep. 30, 2012	Sep. 30, 2011
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Sales of product and services	$ 250,178	$ 193,493	[1]	$ 484,460	$ 362,814	[1]
Financing revenue	7,413	7,305	[1]	15,313	14,739	[1]
Fee and other income	2,460	2,857	[1]	5,002	5,001	[1]
TOTAL REVENUES	260,051	203,655	[1]	504,775	382,554	[1]
COSTS AND EXPENSES
Cost of sales, product and services	205,199	158,429	[1]	399,590	299,103	[1]
Direct lease costs	2,461	2,078	[1]	4,704	4,174	[1]
Total cost of sales	207,660	160,507	[1]	404,294	303,277	[1]
Professional and other fees	2,707	2,355	[1]	5,820	4,780	[1]
Salaries and benefits	26,919	24,090	[1]	53,273	47,096	[1]
General and administrative expenses	5,411	4,507	[1]	10,066	8,540	[1]
Interest and financing costs	446	348	[1]	851	730	[1]
Total expenses	35,483	31,300	[1]	70,010	61,146	[1]
TOTAL COSTS AND EXPENSES	243,143	191,807	[1]	474,304	364,423	[1]
EARNINGS BEFORE PROVISION FOR INCOME TAXES	16,908	11,848	[1]	30,471	18,131	[1]
PROVISION FOR INCOME TAXES	6,875	4,784	[1]	12,376	7,364	[1]
NET EARNINGS	$ 10,033	$ 7,064	[1]	$ 18,095	$ 10,767	[1]
NET EARNINGS PER COMMON SHARE-BASIC (In dollars per share)	$ 1.29	$ 0.87	[1]	$ 2.34	$ 1.31	[1]
NET EARNINGS PER COMMON SHARE-DILUTED (In dollars per share)	$ 1.27	$ 0.85	[1]	$ 2.29	$ 1.28	[1]
WEIGHTED AVERAGE SHARES OUTSTANDING-BASIC (In shares)	7,770,206	8,153,495	[1]	7,745,506	8,230,022	[1]
WEIGHTED AVERAGE SHARES OUTSTANDING-DILUTED (In shares)	7,920,927	8,327,748	[1]	7,912,818	8,422,099	[1]

[1] See Note 2, "Restatement of Financial Statements."