DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	May 31, 2015
Accrued Liabilities [Abstract]
Employee compensation and benefits	$ 68,882		$ 28,599
Accrued interest on 5.50% Senior Notes	10,425		10,424
Warranty obligation, short-term portion	15,736		7,550
VAT/Sales Tax Payable	11,804		5,353
Derivative Liability, Current	3,275		2,947
Accrued Income Taxes	5,692		5,583
Marketing Incentives	25,369		0
Discounts Reserve	46,894		0
Accrued Provision For Returns, Current	24,632		0
Accrued other	52,806		16,655
Accrued Deferred Revenue, Current	133,200		2,986
Accrued liabilities	$ 398,715	$ 91,230	$ 80,097
5.50% Senior Notes | Senior notes
Debt Instrument [Line Items]
Stated interest rate				5.50%	5.50%