FAIR VALUE MEASUREMENT OF ASSETS AND LIABILITIES - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in amount of contingent consideration liability	$ 0	$ (2,221,000)	$ 0	$ (2,221,000)
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
Cost of sales | Nextracker
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in amount of contingent consideration liability			$ 5,100,000