Proposed Merger (Notes)	6 Months Ended
Mar. 31, 2019
Business Combinations [Abstract]
Proposed Merger	Note 17 — Proposed Merger On April 1, 2019, we entered into the Merger Agreement, pursuant to which Merger Sub will merge with and into the Partnership, with the Partnership surviving as an indirect, wholly owned subsidiary of UGI. Under the terms of the Merger Agreement, at the effective time of the Proposed Merger, each outstanding Common Unit other than Common Units owned by UGI and its subsidiaries, including the General Partner, will be converted into the right to receive, at the election of each holder of such Common Units, one of the following forms of merger consideration: (i)0.6378 shares of UGI common stock; (ii)$7.63 in cash, without interest, and 0.500 shares of UGI common stock; or (iii)$35.325 in cash, without interest. The merger consideration is subject to proration designed to ensure that the total number of shares of UGI common stock issuable as merger consideration will equal approximately 34.6 million shares, and the amount of cash consideration paid will equal approximately $530. Also, at the effective time of the Proposed Merger, the General Partner’s 1% economic general partner interest in AmeriGas Partners, which includes its incentive distribution rights, will convert into (i) 10,615,711 Common Units, which will remain outstanding as partnership interests in AmeriGas Partners, and (ii) a non-economic general partner interest in AmeriGas Partners. Pursuant to the Merger Agreement, the General Partner will declare and cause to pay regular quarterly cash distributions on outstanding Common Units in accordance with the Partnership Agreement in an amount that will not be less than $0.95 per Common Unit. In addition, the Merger Agreement requires that the record date for the quarterly cash distribution related to the quarter immediately prior to the quarter in which the closing of the Proposed Merger occurs be designated so that such record date precedes the closing of the Proposed Merger so as to permit the payment of such quarterly distribution to the holders of the Common Units; provided that the Partnership’s unitholders are not intended to receive, for any quarter, distributions both in respect of Common Units and also dividends in respect of shares of UGI common stock that they receive in exchange for such Common Units in the transaction. Completion of the Proposed Merger is subject to certain customary conditions, including, among others: (i) approval of the Merger Agreement by holders of a majority of the outstanding Common Units; (ii) there being no law or injunction prohibiting consummation of the transactions contemplated under the Merger Agreement; (iii) the effectiveness of a registration statement on Form S-4 relating to the issuance of shares of UGI common stock pursuant to the Merger Agreement; (iv) approval for listing on the New York Stock Exchange of the shares of UGI common stock issuable pursuant to the Merger Agreement; (v) subject to specified materiality standards, the accuracy of certain representations and warranties of the other party; and (vi) compliance by the respective parties in all material respects with their respective covenants. Pursuant to a Support Agreement, the General Partner has agreed to vote all Partnership Common Units that it or its affiliates beneficially own as of the record date of the Special Meeting in favor of the Merger Agreement and the Proposed Merger. The Merger Agreement provides for certain termination rights for both UGI and the Partnership which, under certain circumstances, would require the Partnership to pay UGI a termination fee of $20 and/or reimburse UGI for expenses in an amount not to exceed $5, or require UGI to reimburse the Partnership for expenses not to exceed $5. Upon completion of the Proposed Merger, Common Units will no longer be publicly traded. Subject to the satisfaction or waiver of certain conditions, including the approval of the Merger Agreement by AmeriGas Partners’ unitholders, the Proposed Merger is expected to close in the fourth quarter of Fiscal 2019. On May 6, 2019, UGI filed with the SEC its registration statement on Form S-4 relating to the Proposed Merger.

Note 17 — Proposed Merger

On April 1, 2019, we entered into the Merger Agreement, pursuant to which Merger Sub will merge with and into the Partnership, with the Partnership surviving as an indirect, wholly owned subsidiary of UGI. Under the terms of the Merger Agreement, at the effective time of the Proposed Merger, each outstanding Common Unit other than Common Units owned by UGI and its subsidiaries, including the General Partner, will be converted into the right to receive, at the election of each holder of such Common Units, one of the following forms of merger consideration:

(i)0.6378 shares of UGI common stock;

(ii)$7.63 in cash, without interest, and 0.500 shares of UGI common stock; or

(iii)$35.325 in cash, without interest.

The merger consideration is subject to proration designed to ensure that the total number of shares of UGI common stock issuable as merger consideration will equal approximately 34.6 million shares, and the amount of cash consideration paid will equal approximately $530. Also, at the effective time of the Proposed Merger, the General Partner’s 1% economic general partner interest in AmeriGas Partners, which includes its incentive distribution rights, will convert into (i) 10,615,711 Common Units, which will remain outstanding as partnership interests in AmeriGas Partners, and (ii) a non-economic general partner interest in AmeriGas Partners. Pursuant to the Merger Agreement, the General Partner will declare and cause to pay regular quarterly cash distributions on outstanding Common Units in accordance with the Partnership Agreement in an amount that will not be less than $0.95 per Common Unit. In addition, the Merger Agreement requires that the record date for the quarterly cash distribution related to the quarter immediately prior to the quarter in which the closing of the Proposed Merger occurs be designated so that such record date precedes the closing of the Proposed Merger so as to permit the payment of such quarterly distribution to the holders of the Common Units; provided that the Partnership’s unitholders are not intended to receive, for any quarter, distributions both in respect of Common Units and also dividends in respect of shares of UGI common stock that they receive in exchange for such Common Units in the transaction.

Completion of the Proposed Merger is subject to certain customary conditions, including, among others: (i) approval of the Merger Agreement by holders of a majority of the outstanding Common Units; (ii) there being no law or injunction prohibiting consummation of the transactions contemplated under the Merger Agreement; (iii) the effectiveness of a registration statement on Form S-4 relating to the issuance of shares of UGI common stock pursuant to the Merger Agreement; (iv) approval for listing on the New York Stock Exchange of the shares of UGI common stock issuable pursuant to the Merger Agreement; (v) subject to specified materiality standards, the accuracy of certain representations and warranties of the other party; and (vi) compliance by the respective parties in all material respects with their respective covenants.

Pursuant to a Support Agreement, the General Partner has agreed to vote all Partnership Common Units that it or its affiliates beneficially own as of the record date of the Special Meeting in favor of the Merger Agreement and the Proposed Merger.

The Merger Agreement provides for certain termination rights for both UGI and the Partnership which, under certain circumstances, would require the Partnership to pay UGI a termination fee of $20 and/or reimburse UGI for expenses in an amount not to exceed $5, or require UGI to reimburse the Partnership for expenses not to exceed $5.

Upon completion of the Proposed Merger, Common Units will no longer be publicly traded. Subject to the satisfaction or waiver of certain conditions, including the approval of the Merger Agreement by AmeriGas Partners’ unitholders, the Proposed Merger is expected to close in the fourth quarter of Fiscal 2019. On May 6, 2019, UGI filed with the SEC its registration statement on Form S-4 relating to the Proposed Merger.