SHARE-BASED COMPENSATION - Options Rollforward (Details) - $ / shares	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
2010 Equity Incentive Plan
Option Activity
Outstanding, beginning of fiscal year, Options (in shares)	2,369,636	15,992,894	23,612,872
Granted (in shares)	0	0	15,000
Exercised, Options (in shares)	(1,573,356)	(10,006,774)	(3,600,900)
Forfeited, Options (in shares)	(653,953)	(3,616,484)	(4,034,078)
Outstanding, end of fiscal year, Options (in shares)	142,327	2,369,636	15,992,894
Options exercisable, end of fiscal year, Options (in shares)	138,950	2,359,527	15,959,173
Weighted Average Exercise Price Activity
Outstanding, beginning of fiscal year, Price (in dollars per share)	$ 8.31	$ 7.81	$ 8.57
Granted, Price (in dollars per share)	0.00	0.00	11.11
Exercised, Price (in dollars per share)	6.89	6.10	6.53
Forfeited, Price (in dollars per share)	12.39	12.23	13.17
Outstanding, end of fiscal year, Price (in dollars per share)	8.97	8.31	7.81
Options exercisable, end of fiscal year, Price (in dollars per share)	$ 8.93	$ 8.30	$ 7.81
2014 NEXTracker Equity Incentive Plan
Option Activity
Outstanding, beginning of fiscal year, Options (in shares)	2,741,854	0
Granted (in shares)	0	3,205,806
Exercised, Options (in shares)	(709,845)	(237,380)
Forfeited, Options (in shares)	(395,993)	(226,572)
Outstanding, end of fiscal year, Options (in shares)	1,636,016	2,741,854	0
Options exercisable, end of fiscal year, Options (in shares)	369,015	223,869
Weighted Average Exercise Price Activity
Outstanding, beginning of fiscal year, Price (in dollars per share)	$ 3.44	$ 0.00
Granted, Price (in dollars per share)	0.00	3.28
Exercised, Price (in dollars per share)	2.24	0.99
Forfeited, Price (in dollars per share)	4.64	3.75
Outstanding, end of fiscal year, Price (in dollars per share)	3.61	3.44	$ 0.00
Options exercisable, end of fiscal year, Price (in dollars per share)	$ 5.00	$ 4.95