SEGMENT REPORTING - Segment Reporting Information, by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
SEGMENT REPORTING [Abstract]
Net sales	$ 608,826	$ 493,372	$ 1,246,141	$ 1,029,024
Cost of sales	446,702	366,070	935,801	774,848
Gross profit	162,124	127,302	310,340	254,176
Operating Segments [Member]
SEGMENT REPORTING [Abstract]
Net sales	608,775	493,280	1,245,979	1,028,781
Cost of sales	446,637	365,999	935,672	774,706
Gross profit	162,138	127,281	310,307	254,075
Product Segment [Member]
SEGMENT REPORTING [Abstract]
Net sales	485,014	389,613	1,005,909	846,925
Product Segment [Member] | Operating Segments [Member]
SEGMENT REPORTING [Abstract]
Net sales	485,014	389,613	1,005,909	846,925
Cost of sales	366,001	300,254	780,414	659,061
Gross profit	119,013	89,359	225,495	187,864
Professional Services Segment [Member]
SEGMENT REPORTING [Abstract]
Net sales	76,344	61,900	148,073	99,179
Professional Services Segment [Member] | Operating Segments [Member]
SEGMENT REPORTING [Abstract]
Net sales	76,344	61,900	148,073	99,179
Cost of sales	47,172	36,317	90,748	58,141
Gross profit	29,172	25,583	57,325	41,038
Managed Services Segment [Member]
SEGMENT REPORTING [Abstract]
Net sales	47,417	41,767	91,997	82,677
Managed Services Segment [Member] | Operating Segments [Member]
SEGMENT REPORTING [Abstract]
Net sales	47,417	41,767	91,997	82,677
Cost of sales	33,464	29,428	64,510	57,504
Gross profit	13,953	12,339	27,487	25,173
Other [Member] | Operating Segments [Member]
SEGMENT REPORTING [Abstract]
Net sales	51	92	162	243
Cost of sales	65	71	129	142
Gross profit	$ (14)	$ 21	$ 33	$ 101