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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Property, Plant and Equipment [Line Items]
Proceeds from sale of property, plant and equipment			$ 15,739	$ 656
Gain on sale of assets	$ 8,083	$ 0	8,083	$ 0
Impairment charges	21,200
Office space in Boston, MA
Property, Plant and Equipment [Line Items]
Sale of property			7,800
Proceeds from sale of property, plant and equipment			15,000
Non-cash consideration			900
Gain on sale of assets			$ 8,100
HDC Line
Property, Plant and Equipment [Line Items]
Impairment charges	19,800
Non-core and Underperforming Assets
Property, Plant and Equipment [Line Items]
Impairment charges	$ 1,400