v3.25.4

Other Matters - Sale of Marketable Equity Securities (Details) - USD ($) $ in Millions		9 Months Ended
	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
Marketable Securities [Abstract]
Number of shares owned	1,468,337
Proceeds from sale of marketable equity securities		$ 6.0
Realized (gain) loss on sale of marketable equity securities	$ (0.8)	$ 0.6	$ (0.2)

X

- Definition

Number of Shares Owned

+ References

No definition available.

+ Details

Name:	ngl_NumberOfSharesOwned
Namespace Prefix:	ngl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_MarketableSecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of realized gain (loss) on investment in marketable security.

+ References

No definition available.

+ Details

Name:	us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration