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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Share-based compensation        
Expected dividends 0.00%      
Granted (in shares) 0 0 0  
Options, outstanding (in shares) 6,878 142,327 2,369,636 15,992,894
Options, outstanding (in dollars per share) $ 9.78 $ 8.97 $ 8.31 $ 7.81
Share bonus awards        
Share-based compensation        
Granted (in shares) 6,155,761 8,261,666 7,619,722  
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 14.52 $ 12.44 $ 10.77 $ 9.01
Options vested (in shares) 6,473,562 8,606,246 8,529,378  
Unvested share bonus targeted number of awards, beginning of period (in shares) 13,892,042 15,698,582 17,000,076 18,993,252
Share Bonus Awards with Market Conditions        
Share-based compensation        
Expected dividends 0.00% 0.00% 0.00%  
Requisite service period 3 years 3 years 3 years  
Unvested share bonus targeted number of awards, beginning of period (in shares) 1,950,072      
Equity instruments other than options, aggregate intrinsic value of instruments vested $ 108,400,000 $ 109,500,000 $ 103,200,000  
2010 Equity Incentive Plan        
Share-based compensation        
Intrinsic value of options exercised during period 1,100,000 9,300,000 55,300,000  
Cash received from option exercises $ 1,100,000 $ 10,900,000 $ 61,100,000  
2010 Equity Incentive Plan | Options        
Share-based compensation        
Granted (in shares) 0 0 0  
2014 NEXTracker Equity Incentive Plan        
Share-based compensation        
Expected dividends 0.00%   0.00%  
Granted (in shares) 288,386 0 3,205,806  
Options, outstanding (in shares) 1,061,260 1,636,016 2,741,854 0
Options, outstanding (in dollars per share) $ 3.55 $ 3.61 $ 3.44 $ 0.00
Cash received from option exercises $ 1,700,000 $ 1,600,000 $ 200,000  
Aggregate intrinsic value, options outstanding 13,600,000      
Aggregate intrinsic value, options vested and expected to vest 13,600,000      
Aggregate intrinsic value, options exercisable 4,000,000      
Intrinsic value of exercisable options of shares considered 'In-the-Money' (shares) $ 1,100,000      
Weighted-average fair value (in dollars per share) $ 16.29   $ 7.76  
2014 NEXTracker Equity Incentive Plan | Options | Minimum        
Share-based compensation        
Vesting period 2 years      
2014 NEXTracker Equity Incentive Plan | Options | Maximum        
Share-based compensation        
Vesting period 4 years      
2014 NEXTracker Equity Incentive Plan | Options | Non-Employee Directors        
Share-based compensation        
Expiration period of options issued 10 years      
2014 NEXTracker Equity Incentive Plan | Share bonus awards        
Share-based compensation        
Vesting period 3 years      
Share weighted-average remaining vesting period 2 years 6 months      
Unrecognized compensation expense $ 10,500,000      
Granted (in shares) 524,978 0 2,393,195  
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 11.85 $ 10.23 $ 10.27 $ 0.00
Options vested (in shares) 471,831 705,738 31,925  
Unvested share bonus targeted number of awards, beginning of period (in shares) 727,650 1,543,437 2,309,096 0
Equity instruments other than options, Aggregate value of instruments exercised $ 7,300,000 $ 8,000,000 $ 2,300,000  
Intrinsic value of options exercisable $ 8,000,000 $ 9,600,000    
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      
2014 NEXTracker Equity Incentive Plan | Share options        
Share-based compensation        
Share weighted-average remaining vesting period 2 years 1 month 20 days      
Unrecognized compensation expense $ 6,300,000      
2017 Equity Incentive Plan        
Share-based compensation        
Shares available for grants (in shares) 22,200,000      
2017 Equity Incentive Plan | Options        
Share-based compensation        
Vesting period 4 years      
Expiration period of options issued 10 years      
Granted (in shares) 0      
2017 Equity Incentive Plan | Options | Non-Employee Directors        
Share-based compensation        
Expiration period of options issued 5 years      
2017 Equity Incentive Plan | Share bonus awards        
Share-based compensation        
Share weighted-average remaining vesting period 2 years 5 months 27 days      
Cash consideration to acquire a specified number of ordinary shares in exchange for continued service $ 0      
Unrecognized compensation expense $ 134,200,000      
2017 Equity Incentive Plan | Share bonus awards | Minimum        
Share-based compensation        
Vesting period 3 years      
2017 Equity Incentive Plan | Share bonus awards | Maximum        
Share-based compensation        
Vesting period 5 years      
2017 Equity Incentive Plan | Share Bonus Awards with Market Conditions        
Share-based compensation        
Unrecognized compensation expense $ 14,200,000      
2017 Equity Incentive Plan | Share options        
Share-based compensation        
Share weighted-average remaining vesting period 6 months      
$13.09 | Share bonus awards        
Share-based compensation        
Granted (in shares) 4,700,000      
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 16.57      
$12.10 | Share bonus awards | Officer        
Share-based compensation        
Vesting period 3 years      
Granted (in shares) 200,000      
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 16.34      
$12.10 | Share bonus awards | Officer | Minimum        
Share-based compensation        
Options vested (in shares) 0      
$12.10 | Share bonus awards | Officer | Maximum        
Share-based compensation        
Options vested (in shares) 400,000.0      
$14.96 | Share bonus awards | Key Employees        
Share-based compensation        
Granted (in shares) 600,000      
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 20.25      
Fiscal 2015 | Share Bonus Awards with Market Conditions        
Share-based compensation        
Equity instruments other than options, aggregate intrinsic value of instruments vested $ 1,400,000