CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Sales of product and services	$ 260,891	$ 218,844	$ 715,545	$ 615,729
Lease revenue	9,028	8,537	23,767	27,801
Fee and other income	2,686	2,598	7,687	8,358
Patent Settlement income	0	0	0	125
TOTAL REVENUES	272,605	229,979	746,999	652,013
COSTS AND EXPENSES
Cost of sales, product and services	222,180	185,018	613,123	525,284
Direct lease costs	2,245	2,153	6,419	6,843
Total cost of sales	224,425	187,171	619,542	532,127
Professional and other fees	2,938	3,709	7,718	10,937
Salaries and benefits	25,596	21,506	72,692	62,153
General and administrative expenses	4,878	3,704	13,418	10,502
Impairment of goodwill	0	0	0	0
Interest and financing costs	334	585	1,064	2,067
Total expenses	33,746	29,504	94,892	85,659
TOTAL COSTS AND EXPENSES (1)	258,171	216,675	714,434	617,786
EARNINGS BEFORE PROVISION FOR INCOME TAXES	14,434	13,304	32,565	34,227
PROVISION FOR INCOME TAXES	5,691	5,755	13,055	14,056
NET EARNINGS	$ 8,743	$ 7,549	$ 19,510	$ 20,171
NET EARNINGS PER COMMON SHARE-BASIC	$ 1.12	$ 0.91	$ 2.41	$ 2.47
NET EARNINGS PER COMMON SHARE-DILUTED	$ 1.10	$ 0.89	$ 2.35	$ 2.41
WEIGHTED AVERAGE SHARES OUTSTANDING-BASIC	7,818,666	8,251,715	8,092,404	8,170,866
WEIGHTED AVERAGE SHARES OUTSTANDING-DILUTED	7,970,368	8,451,130	8,292,176	8,383,415