SHARE-BASED COMPENSATION (Details 2) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Share options
Share-based compensation
Options exercisable (shares)	0	0
Weighted average exercise price of exercisable shares (in dollars per share) \| $ / shares	$ 0.00	$ 0.00
2010 Equity Incentive Plan \| Share options
Share-based compensation
Share options outstanding (in shares)	4,200,000	4,200,000
Options outstanding, weighted average exercise price (in dollars per share) \| $ / shares	$ 6.58	$ 6.58
Weighted average exercise price of exercisable shares (in dollars per share) \| $ / shares	$ 6.57	$ 6.57
2010 Equity Incentive Plan \| Restricted Stock Units, Share Bonus Awards with Market Conditions, and Share Bonus Awards With Free Cash Flow Targets
Share-based compensation
Share weighted-average remaining vesting period		2 years 7 months 8 days
Unvested share bonus awards granted (in shares)		6,400,000
Number of shares outstanding (in shares)	17,100,000	17,100,000
Unrecognized compensation expense \| $	$ 110.3	$ 110.3
2010 Equity Incentive Plan \| Restricted Stock Units
Share-based compensation
Unvested share bonus awards granted (in shares)		5,500,000
Average grant date price of unvested share bonus awards (in dollars per share) \| $ / shares		$ 11.93
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions
Share-based compensation
Number of shares outstanding (in shares)	3,600,000	3,600,000
Unrecognized compensation expense \| $	$ 16.7	$ 16.7
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Fiscal 2013
Share-based compensation
Shares vested (in shares)		2,200,000
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Minimum
Share-based compensation
Number of shares that may be issued (in shares)		0
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Maximum
Share-based compensation
Number of shares that may be issued (in shares)		7,200,000
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Key employees
Share-based compensation
Unvested share bonus awards granted (in shares)		700,000
Average grant date price of unvested share bonus awards (in dollars per share) \| $ / shares		$ 14.96
Vesting period		3 years
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Key employees \| Minimum
Share-based compensation
Unvested share bonus awards granted (in shares)		0
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Key employees \| Maximum
Share-based compensation
Unvested share bonus awards granted (in shares)		1,400,000.0
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Certain executive officers
Share-based compensation
Vesting period		3 years
Measurement period		3 years
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Certain executive officers \| Minimum
Share-based compensation
Unvested share bonus awards granted (in shares)		0
2010 Equity Incentive Plan \| Share Bonus Awards with Market Conditions \| Certain executive officers \| Maximum
Share-based compensation
Unvested share bonus awards granted (in shares)		400,000
2010 Equity Incentive Plan \| Share Bonus Awards With Free Cash Flow Targets \| Certain executive officers
Share-based compensation
Unvested share bonus awards granted (in shares)		200,000
Nonvested average grant date price (in dollars per share) \| $ / shares	$ 12.10	$ 12.10
2010 Equity Incentive Plan \| Half of the share bonus awards with market conditions \| Fiscal 2012
Share-based compensation
Shares vested (in shares)		500,000
2014 NEXTracker Equity Incentive Plan
Share-based compensation
Share weighted-average remaining vesting period		2 years 7 months 15 days
Unvested share bonus awards granted (in shares)		2,900,000
Average grant date price of unvested share bonus awards (in dollars per share) \| $ / shares		$ 10.27
Number of shares outstanding (in shares)	2,700,000	2,700,000
Unrecognized compensation expense \| $	$ 24.4	$ 24.4
Options granted in period (shares)	2,700,000
Options granted, weighted average exercise price (usd per share) \| $ / shares	$ 7.76
2014 NEXTracker Equity Incentive Plan \| Minimum
Share-based compensation
Vesting period	2 years	2 years
2014 NEXTracker Equity Incentive Plan \| Maximum
Share-based compensation
Vesting period	4 years	3 years
2014 NEXTracker Equity Incentive Plan \| Share options
Share-based compensation
Compensation not yet recognized \| $	$ 16.3	$ 16.3
Share weighted-average remaining vesting period		3 years 1 month 6 days
Share options outstanding (in shares)	2,500,000	2,500,000
Options exercisable (shares)	300,000	300,000
Options outstanding, weighted average exercise price (in dollars per share) \| $ / shares	$ 3.90	$ 3.90
Weighted average exercise price of exercisable shares (in dollars per share) \| $ / shares	$ 2.84	$ 2.84
2014 NEXTracker Equity Incentive Plan \| Share Bonus Awards with Operating Profit Target Conditions
Share-based compensation
Unvested share bonus awards granted (in shares)		1,400,000
Vesting period		3 years

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