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Acquisitions (Details 5) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2013
item
Sep. 30, 2014
item
Mar. 31, 2014
item
Acquisitions      
Number of business combination agreements 2us-gaap_NumberOfBusinessesAcquired    
Cash paid $ 14,000us-gaap_PaymentsToAcquireBusinessesGross    
Retail propane      
Acquisitions      
Number of business combination agreements   3us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ngl_RetailPropaneBusinessMember		 4us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ngl_RetailPropaneBusinessMember
Cash paid   6,400us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_RetailPropaneBusinessMember		  
Retail propane and liquids      
Acquisitions      
Cash paid     21,900us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_RetailPropaneBusinessAndNaturalGasLiquidsTerminalsMember
Natural gas liquids terminals      
Acquisitions      
Number of business combination agreements     4us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ngl_NaturalGasLiquidsTerminalsMember