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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Share-based compensation        
Aggregate intrinsic value, outstanding $ 1,200,000      
Options        
Share-based compensation        
Expiration period of options issued     7 years  
Share Bonus Awards with Market Conditions        
Share-based compensation        
Requisite service period 3 years 3 years 3 years  
2010 Equity Incentive Plan        
Share-based compensation        
Shares available for grants (in shares) 18,100,000      
Expected dividends 0.00% 0.00% 0.00%  
Granted (in shares) 0 0 15,000  
Options, outstanding (in shares) 142,327 2,369,636 15,992,894 23,612,872
Options, outstanding (in dollars per share) $ 8.97 $ 8.31 $ 7.81 $ 8.57
Intrinsic value of options exercised during period $ 9,300,000 $ 55,300,000 $ 16,300,000  
Cash received from option exercises $ 10,900,000 $ 61,100,000 $ 23,500,000  
2010 Equity Incentive Plan | Options        
Share-based compensation        
Vesting period 4 years      
Expiration period of options issued 7 years      
Expected dividends     0.00%  
Granted (in shares) 0 0 0  
Award options in the money (shares) 200,000      
Weighted average fair value (in dollars per share)     $ 4.85  
2010 Equity Incentive Plan | Options | Non-Employee Directors        
Share-based compensation        
Expiration period of options issued 5 years      
2010 Equity Incentive Plan | Share bonus awards        
Share-based compensation        
Share weighted-average remaining vesting period 2 years 6 months      
Cash consideration to acquire a specified number of ordinary shares in exchange for continued service $ 0      
Unrecognized compensation expense $ 130,000,000      
Granted (in shares) 6,578,366 7,619,722 6,963,125  
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 12.44 $ 10.77 $ 9.01 $ 7.32
Options vested (in shares) 6,922,946 8,529,378 7,246,056  
Unvested share bonus targeted number of awards, beginning of period (in shares) 15,698,582 17,000,076 18,993,252 21,848,120
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        
Unrecognized compensation expense $ 14,400,000      
Expected dividends 0.00% 0.00% 0.00%  
Unvested share bonus targeted number of awards, beginning of period (in shares) 2,121,710      
Equity instruments other than options, aggregate intrinsic value of instruments vested $ 109,500,000 $ 103,200,000 $ 79,000,000  
2010 Equity Incentive Plan | Share options        
Share-based compensation        
Share weighted-average remaining vesting period 1 year 6 months      
2014 NEXTracker Equity Incentive Plan        
Share-based compensation        
Shares available for grants (in shares) 0      
Expected dividends   0.00% 0.00%  
Granted (in shares) 0 3,205,806    
Options, outstanding (in shares) 1,636,016 2,741,854 0  
Options, outstanding (in dollars per share) $ 3.61 $ 3.44 $ 0.00  
Cash received from option exercises $ 1,600,000 $ 200,000    
Aggregate intrinsic value, options outstanding 22,200,000      
Aggregate intrinsic value, options vested and expected to vest 22,200,000      
Aggregate intrinsic value, options exercisable 4,500,000      
Intrinsic value of exercisable options of shares considered 'In-the-Money' (shares) $ 1,600,000      
Weighted average fair value (in dollars per share)   $ 7.76    
2014 NEXTracker Equity Incentive Plan | Options        
Share-based compensation        
Granted (in shares)     0  
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 1 year 6 months 15 days      
Unrecognized compensation expense $ 11,000,000      
Granted (in shares) 0 2,393,195    
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 10.23 $ 10.27 $ 0.00  
Options vested (in shares) 705,738 31,925    
Unvested share bonus targeted number of awards, beginning of period (in shares) 1,543,437 2,309,096 0  
Equity instruments other than options, Aggregate value of instruments exercised $ 8,000,000 $ 2,300,000    
Intrinsic value of options exercisable $ 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 1 year 9 months 26 days      
Unrecognized compensation expense $ 8,700,000      
BrightBox Technologies 2013 Plan | Share options        
Share-based compensation        
Vesting period 3 years      
Share weighted-average remaining vesting period 2 years 1 month 6 days      
Unrecognized compensation expense $ 1,400,000      
Granted (in shares) 200,000      
Options, outstanding (in shares) 200,000      
Options, outstanding (in dollars per share) $ 0.51      
Weighted average fair value (in dollars per share) $ 11.99      
Elementum S C M Cayman Ltd | Options        
Share-based compensation        
Shares available for grants (in shares) 100,000      
Expiration period of options issued 10 years      
Share weighted-average remaining vesting period 2 years 6 months 29 days      
Unrecognized compensation expense $ 5,700,000      
Options, outstanding (in shares) 33,600,000      
Options, outstanding (in dollars per share) $ 0.39      
Cash received from exercise of stock options $ 600,000      
Elementum S C M Cayman Ltd | Options | Minimum        
Share-based compensation        
Vesting period 2 years      
Elementum S C M Cayman Ltd | Options | Maximum        
Share-based compensation        
Vesting period 4 years      
$13.09 | 2010 Equity Incentive Plan | Share bonus awards        
Share-based compensation        
Granted (in shares) 5,700,000      
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 13.09      
$12.10 | 2010 Equity Incentive Plan | 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) $ 12.82      
$12.10 | 2010 Equity Incentive Plan | Share bonus awards | Officer | Minimum        
Share-based compensation        
Options vested (in shares) 0      
$12.10 | 2010 Equity Incentive Plan | Share bonus awards | Officer | Maximum        
Share-based compensation        
Options vested (in shares) 400,000.0      
$14.96 | 2010 Equity Incentive Plan | Share bonus awards | Key Employees        
Share-based compensation        
Granted (in shares) 700,000      
Unvested share bonus awards, weighted average grant-date fair value (in dollars per share) $ 17.57      
Fiscal 2014 | 2010 Equity Incentive Plan | Share Bonus Awards with Market Conditions        
Share-based compensation        
Equity instruments other than options, aggregate intrinsic value of instruments vested $ 3,500,000