SUPPLEMENTARY FINANCIAL INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Valuation allowance for deferred income taxes
Movement in valuation and qualifying accounts
Beginning Balance	$ 49,413	$ 195,640	$ 184,085
Additions	44,703	11,850	11,555
Deductions	(7,179)	(107,133)	0
Other	0	(50,944)	0
Ending Balance	86,937	49,413	195,640
Price protection, sales returns and other allowances
Movement in valuation and qualifying accounts
Beginning Balance		53,043	65,114
Additions			59,674
Deductions			(74,936)
Other			3,191
Ending Balance			53,043
Allowance for doubtful accounts
Movement in valuation and qualifying accounts
Beginning Balance	995	1,247	1,369
Additions	0	651	0
Deductions	(547)	0	(122)
Other	(5)	(903)	0
Ending Balance	$ 443	995	1,247
Total accounts receivable allowances
Movement in valuation and qualifying accounts
Beginning Balance		$ 54,290	66,483
Additions			59,674
Deductions			(75,058)
Other			3,191
Ending Balance			$ 54,290