UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Sales of product and services	$ 295,679	$ 255,747	$ 843,619	$ 764,067
Financing revenue	8,406	9,228	26,339	27,989
Fee and other income	2,156	2,207	6,059	5,572
TOTAL REVENUES	306,241	267,182	876,017	797,628
Cost of sales, product and services	238,202	207,378	681,852	625,562
Direct lease costs	2,601	3,055	8,364	9,803
Cost of revenues	240,803	210,433	690,216	635,365
Professional and other fees	1,436	2,008	4,846	7,154
Salaries and benefits	35,632	30,795	102,831	91,162
General and administrative expenses	7,233	5,397	20,664	16,457
Interest and financing costs	575	496	1,830	1,389
Operating expenses	44,876	38,696	130,171	116,162
OPERATING INCOME	20,562	18,053	55,630	46,101
Other income	6,169	0	7,603	0
EARNINGS BEFORE PROVISION FOR INCOME TAXES	26,731	18,053	63,233	46,101
PROVISION FOR INCOME TAXES	11,230	7,443	26,303	19,050
NET EARNINGS	$ 15,501	$ 10,610	$ 36,930	$ 27,051
NET EARNINGS PER COMMON SHARE-BASIC (In dollars per share)	$ 2.14	$ 1.33	$ 5.02	$ 3.37
NET EARNINGS PER COMMON SHARE-DILUTED (In dollars per share)	$ 2.13	$ 1.32	$ 4.97	$ 3.34
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING-BASIC (In shares)	7,230	7,950	7,351	7,947
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING-DILUTED (In shares)	7,279	7,982	7,413	8,013