DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Apr. 01, 2018	Mar. 31, 2018
Accrued Liabilities [Abstract]
Accrued Deferred Revenue, Current	$ 101,385		$ 2,986
Employee compensation and benefits	84,346		28,655
Income tax payable	34,897		5,583
Provision for returns	23,911		0
Current portion long term debt	12,750		0
Accrued interest	10,589		10,424
Warranty obligation	18,298		7,550
VAT/Sales tax payable	10,418		5,297
Derivative liabilities	1,718		2,947
Accrued other	109,465		16,655
Accrued liabilities	$ 407,777	$ 91,230	$ 80,097