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Acquisitions (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2013
item
Sep. 30, 2014
item
Mar. 31, 2014
item
Jun. 09, 2014
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		    
Water Supply Company        
Acquisitions        
Cash paid       $ 15,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_WaterSupplyBusinessMember