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Property, Plant and Equipment (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Property, Plant and Equipment              
Property, plant and equipment, gross $ 1,586,370,000us-gaap_PropertyPlantAndEquipmentGross   $ 1,586,370,000us-gaap_PropertyPlantAndEquipmentGross   $ 938,910,000us-gaap_PropertyPlantAndEquipmentGross $ 576,564,000us-gaap_PropertyPlantAndEquipmentGross  
Less: Accumulated depreciation (153,057,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   (153,057,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   (109,564,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (50,127,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Net property, plant and equipment 1,433,313,000us-gaap_PropertyPlantAndEquipmentNet   1,433,313,000us-gaap_PropertyPlantAndEquipmentNet   829,346,000us-gaap_PropertyPlantAndEquipmentNet 526,437,000us-gaap_PropertyPlantAndEquipmentNet  
Depreciation expense 28,400,000us-gaap_Depreciation 13,700,000us-gaap_Depreciation 46,900,000us-gaap_Depreciation 27,200,000us-gaap_Depreciation 59,900,000us-gaap_Depreciation 39,200,000us-gaap_Depreciation 10,600,000us-gaap_Depreciation
Natural gas liquids terminal assets              
Property, Plant and Equipment              
Property, plant and equipment, gross 127,258,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_NaturalGasLiquidsTerminalAssetsMember		   127,258,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_NaturalGasLiquidsTerminalAssetsMember		   75,141,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_NaturalGasLiquidsTerminalAssetsMember		 63,637,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_NaturalGasLiquidsTerminalAssetsMember		  
Natural gas liquids terminal assets | Minimum              
Property, Plant and Equipment              
Useful life     2 years   2 years    
Natural gas liquids terminal assets | Maximum              
Property, Plant and Equipment              
Useful life     30 years   30 years    
Refined products and renewables terminal assets and equipment              
Property, Plant and Equipment              
Useful life     20 years        
Property, plant and equipment, gross 419,411,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_RefinedProductsAndRenewablesTerminalAssetsAndEquipmentMember		   419,411,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_RefinedProductsAndRenewablesTerminalAssetsAndEquipmentMember		        
Retail propane equipment              
Property, Plant and Equipment              
Property, plant and equipment, gross 167,825,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_RetailPropaneEquipmentMember		   167,825,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_RetailPropaneEquipmentMember		   160,758,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_RetailPropaneEquipmentMember		 152,802,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_RetailPropaneEquipmentMember		  
Retail propane equipment | Minimum              
Property, Plant and Equipment              
Useful life     2 years   2 years    
Retail propane equipment | Maximum              
Property, Plant and Equipment              
Useful life     30 years   30 years    
Vehicles and railcars              
Property, Plant and Equipment              
Property, plant and equipment, gross 172,799,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TransportationEquipmentMember		   172,799,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TransportationEquipmentMember		   152,676,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TransportationEquipmentMember		    
Vehicles and railcars | Minimum              
Property, Plant and Equipment              
Useful life     3 years        
Vehicles and railcars | Maximum              
Property, Plant and Equipment              
Useful life     25 years        
Water treatment facilities and equipment              
Property, Plant and Equipment              
Property, plant and equipment, gross 209,644,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_WaterTreatmentFacilitiesAndEquipmentMember		   209,644,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_WaterTreatmentFacilitiesAndEquipmentMember		   180,985,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_WaterTreatmentFacilitiesAndEquipmentMember		 91,944,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_WaterTreatmentFacilitiesAndEquipmentMember		  
Water treatment facilities and equipment | Minimum              
Property, Plant and Equipment              
Useful life     3 years   3 years    
Water treatment facilities and equipment | Maximum              
Property, Plant and Equipment              
Useful life     30 years   30 years    
Crude oil tanks and related equipment              
Property, Plant and Equipment              
Property, plant and equipment, gross 145,287,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember		   145,287,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember		   106,125,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember		 22,577,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember		  
Crude oil tanks and related equipment | Minimum              
Property, Plant and Equipment              
Useful life     2 years   2 years    
Crude oil tanks and related equipment | Maximum              
Property, Plant and Equipment              
Useful life     40 years   40 years    
Barges and towboats              
Property, Plant and Equipment              
Property, plant and equipment, gross 56,094,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MaritimeEquipmentMember		   56,094,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MaritimeEquipmentMember		   52,217,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MaritimeEquipmentMember		 25,963,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MaritimeEquipmentMember		  
Barges and towboats | Minimum              
Property, Plant and Equipment              
Useful life     5 years   5 years    
Barges and towboats | Maximum              
Property, Plant and Equipment              
Useful life     40 years   40 years    
Information technology equipment              
Property, Plant and Equipment              
Property, plant and equipment, gross 30,519,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TechnologyEquipmentMember		   30,519,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TechnologyEquipmentMember		   20,768,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TechnologyEquipmentMember		 12,169,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TechnologyEquipmentMember		  
Information technology equipment | Minimum              
Property, Plant and Equipment              
Useful life     3 years   3 years    
Information technology equipment | Maximum              
Property, Plant and Equipment              
Useful life     7 years   7 years    
Buildings and leasehold improvements              
Property, Plant and Equipment              
Property, plant and equipment, gross 77,415,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember		   77,415,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember		   60,004,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember		 48,975,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember		  
Buildings and leasehold improvements | Minimum              
Property, Plant and Equipment              
Useful life     3 years   3 years    
Buildings and leasehold improvements | Maximum              
Property, Plant and Equipment              
Useful life     40 years   40 years    
Land              
Property, Plant and Equipment              
Property, plant and equipment, gross 88,350,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		   88,350,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		   30,241,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 21,815,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		  
Tank bottoms              
Property, Plant and Equipment              
Property, plant and equipment, gross 17,679,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_TankBottomsMember		   17,679,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_TankBottomsMember		   13,403,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_TankBottomsMember		    
Volume of property, plant and equipment (in barrels) 185,000ngl_PropertyPlantAndEquipmentStorageCapacity
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_TankBottomsMember		   185,000ngl_PropertyPlantAndEquipmentStorageCapacity
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_TankBottomsMember		        
Other              
Property, Plant and Equipment              
Property, plant and equipment, gross 16,770,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		   16,770,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		   6,341,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		 16,104,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember		  
Other | Minimum              
Property, Plant and Equipment              
Useful life     3 years   5 years    
Other | Maximum              
Property, Plant and Equipment              
Useful life     30 years   30 years    
Construction in progress              
Property, Plant and Equipment              
Property, plant and equipment, gross 57,319,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		   57,319,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		   80,251,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		 32,405,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		  
Vehicles              
Property, Plant and Equipment              
Property, plant and equipment, gross         $ 152,676,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember		 $ 88,173,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember		  
Vehicles | Minimum              
Property, Plant and Equipment              
Useful life         3 years    
Vehicles | Maximum              
Property, Plant and Equipment              
Useful life         25 years