DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Property, Plant and Equipment, Net [Abstract]
Land	$ 16,418	$ 16,564
Buildings and improvements (useful life: 7-30 years)	138,000	115,401
Machinery and equipment (useful life: 2-10 years)	158,326	112,719
Software (useful life: 5-10 years)	68,985	50,631
Construction in progress	13,099	5,428
Property, plant, and equipment, gross	394,829	300,743
Accumulated depreciation and amortization	(190,002)	(158,614)
Property, plant, and equipment, net	204,826	142,129
Depreciation and amortization expense	40,600	21,100	$ 20,700
Unamortized capitalized software costs	30,600	23,600
Amortization expense related to capitalized software costs	$ 11,000	$ 4,900	$ 4,400
Building and improvements \| Minimum
Property, Plant and Equipment, Net [Abstract]
Useful life			7 years
Building and improvements \| Maximum
Property, Plant and Equipment, Net [Abstract]
Useful life			30 years
Machinery and equipment \| Minimum
Property, Plant and Equipment, Net [Abstract]
Useful life			2 years
Machinery and equipment \| Maximum
Property, Plant and Equipment, Net [Abstract]
Useful life			10 years
Software \| Minimum
Property, Plant and Equipment, Net [Abstract]
Useful life			5 years
Software \| Maximum
Property, Plant and Equipment, Net [Abstract]
Useful life			10 years

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount of expense for amortization of capitalized computer software costs.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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