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Acquisitions (Details 4) (USD $)
12 Months Ended 6 Months Ended
Mar. 31, 2013
item
Mar. 31, 2014
Sep. 30, 2014
Mar. 31, 2012
Mar. 31, 2011
Jun. 19, 2012
Acquisitions            
Number of business combination agreements 2us-gaap_NumberOfBusinessesAcquired          
Estimated fair values of the assets acquired and liabilities assumed            
Goodwill $ 555,220,000us-gaap_Goodwill 1,107,006,000us-gaap_Goodwill 1,170,490,000us-gaap_Goodwill $ 167,245,000us-gaap_Goodwill $ 8,568,000us-gaap_Goodwill  
Consideration paid for acquisition            
Cash paid, net of cash acquired 14,000,000us-gaap_PaymentsToAcquireBusinessesGross          
Vehicles | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   3 years        
Vehicles | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   25 years        
Buildings and leasehold improvements | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   3 years 3 years      
Buildings and leasehold improvements | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   40 years 40 years      
Crude oil tanks and related equipment            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment           17,851,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember
Crude oil tanks and related equipment | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   2 years 2 years      
Crude oil tanks and related equipment | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   40 years 40 years      
Crude Oil Logistics            
Acquisitions            
Number of business combination agreements   2us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
Common units issued   175,211us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
General and administrative expense   100,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
Estimated fair values of the assets acquired and liabilities assumed            
Accounts receivable - trade   1,235,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
1,221,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Inventories   1,021,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
1,021,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Prepaid expenses and other current assets   54,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
58,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Goodwill   37,867,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
30,730,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Accounts payable - trade   (665,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
(521,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Accrued expenses and other payables   (124,000)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
(266,000)ngl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherPayables
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Fair value of net assets acquired   73,090,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
73,090,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
     
Consideration paid for acquisition            
Cash paid, net of cash acquired   67,800,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
Value of common units issued   5,300,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
Total consideration paid   73,090,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
       
Crude Oil Logistics | Customer relationships            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets   6,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
13,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
Useful life of intangible assets   3 years 3 years      
Crude Oil Logistics | Trade names            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets   530,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
530,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
     
Crude Oil Logistics | Non-compete agreements            
Estimated fair values of the assets acquired and liabilities assumed            
Intangible assets   35,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
35,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
     
Useful life of intangible assets   3 years 3 years      
Crude Oil Logistics | Vehicles            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   2,977,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
2,980,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
     
Crude Oil Logistics | Vehicles | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   5 years 5 years      
Crude Oil Logistics | Vehicles | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   10 years 10 years      
Crude Oil Logistics | Buildings and leasehold improvements            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   280,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
58,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BuildingsAndLeaseholdImprovementsMember
     
Crude Oil Logistics | Buildings and leasehold improvements | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   5 years 5 years      
Crude Oil Logistics | Buildings and leasehold improvements | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   30 years 30 years      
Crude Oil Logistics | Crude oil tanks and related equipment            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   3,462,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember
3,822,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_CrudeOilTanksAndRelatedEquipmentMember
     
Crude Oil Logistics | Crude oil tanks and related equipment | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   2 years 2 years      
Crude Oil Logistics | Crude oil tanks and related equipment | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   30 years 30 years      
Crude Oil Logistics | Barges and towboats            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   20,065,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BargesAndTowboatsMember
20,065,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ngl_BargesAndTowboatsMember
     
Useful life of property, plant and equipment   20 years 20 years      
Crude Oil Logistics | Other            
Estimated fair values of the assets acquired and liabilities assumed            
Property, plant and equipment   53,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
57,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ngl_CrudeOilLogisticsBusinessMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherMachineryAndEquipmentMember
     
Crude Oil Logistics | Other | Minimum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   3 years 3 years      
Crude Oil Logistics | Other | Maximum            
Estimated fair values of the assets acquired and liabilities assumed            
Useful life of property, plant and equipment   5 years 5 years