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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Options        
Share-based compensation        
Expiration period of options issued   7 years 7 years  
2010 Equity Incentive Plan        
Share-based compensation        
Shares available for grants 27,100,000      
Options, outstanding (in shares) 2,369,636 15,992,894 23,612,872 34,405,564
Options, outstanding (in dollars per share) $ 8.31 $ 7.81 $ 8.57 $ 8.29
Granted (in shares) 0 15,000 0  
2010 Equity Incentive Plan | Options        
Share-based compensation        
Vesting period 4 years      
Expiration period of options issued 7 years      
Granted (in shares) 0   0  
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 5 months 24 days      
Cash consideration to acquire a specified number of ordinary shares in exchange for continued service $ 0      
Unrecognized compensation expense $ 97,900      
Granted (in shares) 7,619,722 6,963,125 8,978,941  
Options vested (number of shares) 8,529,378 7,246,056 5,481,153  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 10.77 $ 9.01 $ 7.32 $ 6.80
Unvested share bonus targeted number of awards, beginning of period (in shares) 17,000,076 18,993,252 21,848,120 21,807,069
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 $ 13,700      
Unvested share bonus targeted number of awards, beginning of period (in shares) 3,243,742      
Equity instruments other than options, aggregate intrinsic value of instruments vested $ 103,200 $ 79,000 $ 42,400  
2010 Equity Incentive Plan | Share options        
Share-based compensation        
Share weighted-average remaining vesting period 2 years 3 months 4 days      
2014 NEXTracker Equity Incentive Plan        
Share-based compensation        
Shares available for grants 0      
Options, outstanding (in shares) 2,741,854 0    
Options, outstanding (in dollars per share) $ 3.44 $ 0.00    
Granted (in shares) 3,205,806      
Aggregate intrinsic value of options exercisable $ 23,600 $ 23,600 $ 1,590  
Intrinsic value of shares in-the-money $ 2,700      
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 2 years 4 months 13 days      
Unrecognized compensation expense $ 19,100      
Granted (in shares) 2,393,195      
Options vested (number of shares) 31,925      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 10.27 $ 0.00    
Weighted average fair value (in dollars per share) $ 7.76      
Unvested share bonus targeted number of awards, beginning of period (in shares) 2,309,096 0    
Equity instruments other than options, Aggregate value of instruments exercised $ 2,320      
Aggregate intrinsic value of options exercisable $ 350      
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 9 months 28 days      
Unrecognized compensation expense $ 18,200      
Elementum S C M Cayman Ltd | Options        
Share-based compensation        
Shares available for grants 5,400,000      
Expiration period of options issued 10 years      
Share weighted-average remaining vesting period 2 years 8 months 12 days      
Unrecognized compensation expense $ 5,200      
Options, outstanding (in shares) 26,200,000      
Options, outstanding (in dollars per share) $ 0.35      
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options $ 500      
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      
$12.10 | 2010 Equity Incentive Plan | Share bonus awards | Officer        
Share-based compensation        
Vesting period 3 years      
Granted (in shares) 200,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 12.10      
$12.10 | 2010 Equity Incentive Plan | Share bonus awards | Officer | Minimum        
Share-based compensation        
Options vested (number of shares) 0      
$12.10 | 2010 Equity Incentive Plan | Share bonus awards | Officer | Maximum        
Share-based compensation        
Options vested (number of shares) 400,000.0      
$12.10 | 2014 NEXTracker Equity Incentive Plan | Share bonus awards | Management        
Share-based compensation        
Unvested share bonus targeted number of awards, beginning of period (in shares) 900,000.0      
$12.06 | 2010 Equity Incentive Plan | Share bonus awards | Employee        
Share-based compensation        
Vesting period 4 years      
Granted (in shares) 200,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 12.06      
$12.06 | 2010 Equity Incentive Plan | Share bonus awards | Employee | Minimum        
Share-based compensation        
Options vested (number of shares) 0      
$12.06 | 2010 Equity Incentive Plan | Share bonus awards | Employee | Maximum        
Share-based compensation        
Options vested (number of shares) 400,000.0      
$14.96 | 2010 Equity Incentive Plan | Share bonus awards | Key Employees        
Share-based compensation        
Granted (in shares) 700,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 14.96      
$7.76 | 2014 NEXTracker Equity Incentive Plan | Share bonus awards        
Share-based compensation        
Vesting period 3 years      
Granted (in shares) 500,000