v3.25.4

Other Matters - Sale of Certain Railcars (Details) $ in Millions |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 16, 2025 USD ($) | Apr. 30, 2025 USD ($) | Apr. 14, 2025 USD ($) | Dec. 31, 2025 USD ($) | Mar. 31, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |  |  |
Total number of railcars to be sold |  |  |  |  | 135
Number of railcars sold | 68 |  |  |  |
Total consideration | $ 2.1 | $ 156.3 | $ 40.3 | $ 6.7 |
Gain on disposal or impairment of assets, net |  | $ 55.5 | $ 1.0 |  |
Certain Railcars |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations |  |  |  |  |
Gain on disposal or impairment of assets, net | $ 0.1 |  |  | $ 1.9 |

X
- Definition Number of Railcars Sold + References No definition available. + Details
Name: | ngl_NumberOfRailcarsSold
Namespace Prefix: | ngl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total Number of Railcars to be Sold + References No definition available. + Details
Name: | ngl_TotalNumberOfRailcarsToBeSold
Namespace Prefix: | ngl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-21 + Details
Name: | us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-3A + Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ngl_CertainRailcarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |