DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017	May 31, 2015
Accrued Liabilities [Abstract]
Employee compensation and benefits	$ 23,719	$ 36,415
Accrued interest on 5.50% Senior Notes	3,419	10,407
Warranty obligation	7,418	6,863
VAT/Sales tax payable	6,182	5,433
Derivative liabilities	4,425	1,323
Accrued other	16,743	13,844
Accrued liabilities	$ 61,906	$ 74,285
5.50% Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate of debt instrument	5.50%		5.50%