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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
12 Months Ended
Feb. 13, 2023
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Share-based compensation          
Share-based compensation expense   $ 133,000,000 $ 91,000,000 $ 79,000,000  
RSU          
Share-based compensation          
Granted (in shares)   8,416,650 7,276,643 10,982,109  
Unvested RSU awards outstanding, weighted average grant date fair value (in dollars per share)   $ 16.79 $ 14.13 $ 11.14 $ 11.87
Awards vesting contingent on meeting certain performance conditions (in shares)   15,348,615 17,019,559 17,308,625 16,050,640
RSU With Market Conditions          
Share-based compensation          
Granted (in shares)   500,000      
Unvested RSU awards outstanding, weighted average grant date fair value (in dollars per share)   $ 23.45      
Awards vesting contingent on meeting certain performance conditions (in shares)   2,080,960      
RSU With Market Conditions | Grants In Fiscal Year 2020          
Share-based compensation          
Number of shares vested (in shares)   2,400,000      
RSU With Market Conditions | Fiscal 2023          
Share-based compensation          
Awards vesting contingent on meeting certain performance conditions (in shares)   533,946      
RSU With Performance Conditions          
Share-based compensation          
Awards vesting contingent on meeting certain performance conditions (in shares)   912,532      
RSU With Performance Conditions | Fiscal 2023          
Share-based compensation          
Granted (in shares)   500,000      
Unvested RSU awards outstanding, weighted average grant date fair value (in dollars per share)   $ 16.52      
Awards vesting contingent on meeting certain performance conditions (in shares)   533,946      
RSU with no performance or market conditions          
Share-based compensation          
Granted (in shares)   6,100,000      
Unvested RSU awards outstanding, weighted average grant date fair value (in dollars per share)   $ 17.89      
2017 Equity Incentive Plan          
Share-based compensation          
Shares available for grants (in shares)   11,800,000      
2017 Equity Incentive Plan | RSU          
Share-based compensation          
Cash consideration to acquire a specified number of ordinary shares in exchange for continued service   $ 0      
Unrecognized compensation expense   $ 162,000,000      
Share weighted-average remaining vesting period   2 years      
Requisite service period   3 years 3 years 3 years  
Equity instruments other than options, aggregate intrinsic value of instruments vested   $ 148,000,000 $ 108,000,000 $ 69,000,000  
2017 Equity Incentive Plan | RSU | Minimum          
Share-based compensation          
Vesting period   2 years      
2017 Equity Incentive Plan | RSU | Maximum          
Share-based compensation          
Vesting period   4 years      
2017 Equity Incentive Plan | RSU With Market Conditions          
Share-based compensation          
Unrecognized compensation expense   $ 14,000,000      
2017 Equity Incentive Plan | RSU With Performance Conditions          
Share-based compensation          
Unrecognized compensation expense   9,000,000      
2022 Nextracker Equity Incentive Plan          
Share-based compensation          
Unrecognized compensation expense   $ 46,000,000      
Share weighted-average remaining vesting period   2 years 3 months 18 days      
Equity-based compensation awards awarded (in shares)   5,700,000      
Share-based compensation expense $ 28,000,000        
2022 Nextracker Equity Incentive Plan | Option          
Share-based compensation          
Number of shares vested (in shares)   0      
Options, granted (in shares)   2,806,905      
2022 Nextracker Equity Incentive Plan | NPSU          
Share-based compensation          
Granted (in shares)   219,713      
Unvested RSU awards outstanding, weighted average grant date fair value (in dollars per share)   $ 23.01 $ 0    
Awards vesting contingent on meeting certain performance conditions (in shares)   219,713 0    
Equity-based compensation awards, awarded in period (in shares)   700,000      
2022 Nextracker Equity Incentive Plan | NRSU          
Share-based compensation          
Granted (in shares)   2,172,234      
Unvested RSU awards outstanding, weighted average grant date fair value (in dollars per share)   $ 20.40 $ 0    
Awards vesting contingent on meeting certain performance conditions (in shares)   2,002,419 0    
Equity-based compensation awards, awarded in period (in shares)   2,200,000