v3.25.4

Significant Accounting Policies -Reclassifications (Details) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2025 USD ($)
Accounting Policies [Abstract] |
Immaterial reclassification error | $ 7.3

X
- Definition Immaterial Reclassification Error + References No definition available. + Details
Name: | ngl_ImmaterialReclassificationError
Namespace Prefix: | ngl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration