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Equity - Partnership Equity and General Partner Contributions (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Equity      
General partners' capital account, notional units issued (in units) 1,103 823 4,268
NGL Energy Holdings LLC      
Equity      
Notional units issued $ 0.1 $ 0.1 $ 0.1
Common units      
Equity      
Ownership interest in NGL Energy Holdings LLC 8.69%    
General Partner      
Equity      
General partner interest 0.10%    
General Partner | Common units      
Equity      
General partner interest 0.10%    
Limited Partner      
Equity      
Limited partner interest 99.90%