SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Segment	Sep. 30, 2014 USD ($)	Mar. 31, 2015 USD ($)
SEGMENT REPORTING [Abstract]
Number of business segments | Segment			2
Segment Reporting Information [Line Items]
Sales of product and services	$ 324,259	$ 286,584	$ 583,955	$ 547,940
Financing revenues	10,279	9,059	18,625	17,933
Fee and other income	1,748	1,829	3,572	3,903
Net sales	336,286	297,472	606,152	569,776
Cost of sales, product and services	261,208	230,742	468,926	443,650
Direct lease costs	3,157	2,806	6,175	5,763
Cost of sales	264,365	233,548	475,101	449,413
Professional and other fees	1,513	1,577	3,031	3,410
Salaries and benefits	35,740	34,252	70,954	67,199
General and administrative expenses	7,585	7,158	14,364	13,431
Interest and financing costs	422	611	975	1,255
Operating expenses	45,260	43,598	89,324	85,295
Operating income	26,661	20,326	41,727	35,068
Other income	0	0	0	1,434
Earnings before tax	26,661	20,326	41,727	36,502
Depreciation and amortization	4,268	3,790	8,503	7,631
Purchases of property, equipment and operating lease equipment	8,694	1,450	15,618	1,919
Total assets	590,487	564,446	590,487	564,446	$ 571,546
Operating Segments [Member] | Technology [Member]
Segment Reporting Information [Line Items]
Sales of product and services	324,259	286,584	583,955	547,940
Financing revenues	0	0	0	0
Fee and other income	1,721	1,782	3,532	3,829
Net sales	325,980	288,366	587,487	551,769
Cost of sales, product and services	261,208	230,742	468,926	443,650
Direct lease costs	0	0	0	0
Cost of sales	261,208	230,742	468,926	443,650
Professional and other fees	1,305	1,321	2,567	2,907
Salaries and benefits	33,476	31,963	66,428	62,633
General and administrative expenses	7,322	6,703	13,851	12,461
Interest and financing costs	22	19	41	58
Operating expenses	42,125	40,006	82,887	78,059
Operating income			35,674	30,060
Other income			0	0
Earnings before tax	22,647	17,618	35,674	30,060
Depreciation and amortization	1,229	1,081	2,466	1,975
Purchases of property, equipment and operating lease equipment	576	744	1,194	1,086
Total assets	379,378	341,893	379,378	341,893
Operating Segments [Member] | Financing [Member]
Segment Reporting Information [Line Items]
Sales of product and services	0	0	0	0
Financing revenues	10,279	9,059	18,625	17,933
Fee and other income	27	47	40	74
Net sales	10,306	9,106	18,665	18,007
Cost of sales, product and services	0	0	0	0
Direct lease costs	3,157	2,806	6,175	5,763
Cost of sales	3,157	2,806	6,175	5,763
Professional and other fees	208	256	464	503
Salaries and benefits	2,264	2,289	4,526	4,566
General and administrative expenses	263	455	513	970
Interest and financing costs	400	592	934	1,197
Operating expenses	3,135	3,592	6,437	7,236
Operating income			6,053	5,008
Other income			0	1,434
Earnings before tax	4,014	2,708	6,053	6,442
Depreciation and amortization	3,039	2,709	6,037	5,656
Purchases of property, equipment and operating lease equipment	8,118	706	14,424	833
Total assets	$ 211,109	$ 222,553	$ 211,109	$ 222,553