DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017	May 31, 2015
Accrued Liabilities [Abstract]
Employee compensation and benefits	$ 22,278	$ 36,415
Accrued interest on 5.50% Senior Notes	10,312	10,407
Warranty obligation	6,739	6,863
VAT/Sales tax payable	5,852	5,433
Derivative liabilities	4,588	1,323
Accrued other	18,665	13,844
Accrued liabilities	$ 68,434	$ 74,285
5.50% Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate of debt instrument	5.50%		5.50%