GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2020	Mar. 31, 2020
Intangible Assets [Line Items]
Ending Gross Amount	$ 80,032	$ 79,313
Accumulated Amortization	(47,722)	(44,155)
Trade names and trademarks not being amortized
Intangible Assets [Line Items]
Ending Gross Amount	$ 11,058	11,027
Patents
Intangible Assets [Line Items]
Wtd Avg Life (Years)	11 years
Ending Gross Amount	$ 9,636	9,635
Accumulated Amortization	$ (7,329)	(6,935)
Customer lists and amortized trademarks
Intangible Assets [Line Items]
Wtd Avg Life (Years)	12 years
Ending Gross Amount	$ 63,459	62,806
Accumulated Amortization	$ (35,661)	(33,098)
Non-compete agreements
Intangible Assets [Line Items]
Wtd Avg Life (Years)	5 years
Ending Gross Amount	$ 1,689	1,653
Accumulated Amortization	$ (1,770)	(1,494)
Other
Intangible Assets [Line Items]
Wtd Avg Life (Years)	8 years
Ending Gross Amount	$ 5,248	5,219
Accumulated Amortization	$ (2,962)	$ (2,628)