Summary of Significant Accounting Policies- Property, Plant and Equipment and Related Depreciation (Details)	12 Months Ended
Sep. 30, 2021
UGI Utilities
Public Utility, Property, Plant and Equipment [Line Items]
Amortization period	5 years

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.

No definition available.

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