FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in amount of contingent consideration liability	$ (17,109,000)	$ (40,555,000)	$ (17,109,000)	$ (42,776,000)
Transfers out of Level 1 and into Level 2 related to assets and liabilities measured on a recurring and nonrecurring basis	0	0	0	0
Transfers out of Level 2 and into Level 1 related to assets and liabilities measured on a recurring and nonrecurring basis	0	0	0	0
Transfers out of Level 1 and into Level 2 related to liabilities measured on a recurring and nonrecurring basis	0	0	0	0
Transfers out of Level 2 and into Level 1 related to liabilities measured on a recurring and nonrecurring basis	$ 0	$ 0	$ 0	$ 0
Nextracker
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term of revenue targets after acquisition			2 years
Change in amount of contingent consideration liability			$ (17,100,000)