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Equity - Common Unit Repurchase Program (Details) $ in Millions	Aug. 30, 2019 USD ($)
Share Repurchase Program
Common unit repurchase program, authorized amount	$ 150.0

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=ngl_ShareRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: