SHARE-BASED COMPENSATION - Other Equity Awards Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Share-based compensation
Aggregate intrinsic value of stock options vested and expected to vest	$ 9.4
Share Bonus Awards with Market Conditions | Minimum | Fiscal 2015
Share-based compensation
Vesting (as a percent)	0.00%
Share Bonus Awards with Market Conditions | Minimum | Fiscal 2014
Share-based compensation
Vesting (as a percent)	0.00%
Share Bonus Awards with Market Conditions | Minimum | Fiscal 2013
Share-based compensation
Vesting (as a percent)	0.00%
Share Bonus Awards with Market Conditions | Minimum | Fiscal 2012
Share-based compensation
Vesting (as a percent)	0.00%
Share Bonus Awards with Market Conditions | Maximum | Fiscal 2015
Share-based compensation
Vesting (as a percent)	200.00%
Share Bonus Awards with Market Conditions | Maximum | Fiscal 2014
Share-based compensation
Vesting (as a percent)	200.00%
Share Bonus Awards with Market Conditions | Maximum | Fiscal 2013
Share-based compensation
Vesting (as a percent)	200.00%
Share Bonus Awards with Market Conditions | Maximum | Fiscal 2012
Share-based compensation
Vesting (as a percent)	150.00%
2010 Equity Incentive Plan
Share-based compensation
Expected dividends	0.00%	0.00%	0.00%
2010 Equity Incentive Plan | Share bonus awards
Share-based compensation
Unvested share bonus targeted number of awards, beginning of period (in shares)	18,993,252	21,848,120	21,807,069
Granted (in shares)	7,619,722	6,963,125	8,978,941
Vested (in shares)	(8,529,378)	(7,246,056)	(5,481,153)
Forfeited (in shares)	(1,083,520)	(2,571,937)	(3,456,737)
Unvested share bonus targeted number of awards, end of period (in shares)	17,000,076	18,993,252	21,848,120
Unvested share bonus awards, weighted average grant-date fair value, beginning of period (in dollars per share)	$ 9.01	$ 7.32	$ 6.80
Unvested share bonus targeted awards granted, weighted average grant-date fair value (in dollars per share)	12.23	11.75	8.07
Unvested share bonus awards vested, weighted average grant-date fair value (in dollars per share)	7.93	6.97	6.66
Unvested share bonus awards forfeited, weighted average grant-date fair value (in dollars per share)	9.67	7.70	7.07
Unvested share bonus awards, weighted average grant-date fair value, end of period (in dollars per share)	$ 10.77	$ 9.01	$ 7.32
2010 Equity Incentive Plan | Share bonus awards | Minimum
Share-based compensation
Vesting period	3 years
2010 Equity Incentive Plan | Share bonus awards | Maximum
Share-based compensation
Vesting period	5 years
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions
Share-based compensation
Unvested share bonus targeted number of awards, end of period (in shares)	3,243,742
Expected dividends	0.00%	0.00%	0.00%
Equity instruments other than options, aggregate intrinsic value of instruments vested	$ 103.2	$ 79.0	$ 42.4
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Fiscal 2016
Share-based compensation
Unvested share bonus targeted number of awards, end of period (in shares)	726,995
Unvested share bonus targeted awards granted, weighted average grant-date fair value (in dollars per share)	$ 14.96
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Fiscal 2015
Share-based compensation
Unvested share bonus targeted number of awards, end of period (in shares)	706,747
Unvested share bonus targeted awards granted, weighted average grant-date fair value (in dollars per share)	$ 14.77
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Fiscal 2014
Share-based compensation
Unvested share bonus targeted number of awards, end of period (in shares)	1,810,000
Unvested share bonus targeted awards granted, weighted average grant-date fair value (in dollars per share)	$ 9.36
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Fiscal 2013
Share-based compensation
Equity instruments other than options, aggregate intrinsic value of instruments vested	$ 2.2
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Minimum | Fiscal 2016
Share-based compensation
Number of shares that may be issued	0
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Minimum | Fiscal 2015
Share-based compensation
Number of shares that may be issued	0
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Minimum | Fiscal 2014
Share-based compensation
Number of shares that may be issued	0
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Maximum
Share-based compensation
Number of shares that may be issued	6,487,484
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Maximum | Fiscal 2016
Share-based compensation
Number of shares that may be issued	1,453,990
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Maximum | Fiscal 2015
Share-based compensation
Number of shares that may be issued	1,413,494
2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions | Maximum | Fiscal 2014
Share-based compensation
Number of shares that may be issued	3,620,000
2010 Equity Incentive Plan | Half of the share bonus awards with market conditions | Fiscal 2012
Share-based compensation
Vested (in shares)	(500,000)
2014 NEXTracker Equity Incentive Plan
Share-based compensation
Expected dividends	0.00%	0.00%	0.00%
2014 NEXTracker Equity Incentive Plan | Share bonus awards
Share-based compensation
Unvested share bonus targeted number of awards, beginning of period (in shares)	0
Granted (in shares)	2,393,195
Vested (in shares)	(31,925)
Forfeited (in shares)	(52,174)
Unvested share bonus targeted number of awards, end of period (in shares)	2,309,096	0
Unvested share bonus awards, weighted average grant-date fair value, beginning of period (in dollars per share)	$ 0.00
Unvested share bonus targeted awards granted, weighted average grant-date fair value (in dollars per share)	10.27
Unvested share bonus awards vested, weighted average grant-date fair value (in dollars per share)	10.27
Unvested share bonus awards forfeited, weighted average grant-date fair value (in dollars per share)	10.27
Unvested share bonus awards, weighted average grant-date fair value, end of period (in dollars per share)	$ 10.27	$ 0.00
Vesting period	3 years
2014 NEXTracker Equity Incentive Plan | Share bonus awards | Minimum
Share-based compensation
Vesting period	3 years
2014 NEXTracker Equity Incentive Plan | Share bonus awards | Maximum
Share-based compensation
Vesting period	5 years