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Acquisitions and Divestitures (Details) ¥ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2023 USD ($) | Apr. 30, 2023 USD ($) | Apr. 30, 2023 CNY (¥) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 CNY (¥) | Sep. 30, 2022 USD ($) | Sep. 30, 2022 CNY (¥) | Dec. 31, 2023 USD ($) | Nov. 30, 2023 CNY (¥) | Oct. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 2,094.0 |  |  |  | $ 2,138.0 |  |
YFAT |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination, deposit to acquire interest in joint venture |  |  |  | 11.0 | ¥ 75 | $ 12.0 | ¥ 75 |  |  |
Percent of total consideration |  |  |  |  |  | 50.00% | 50.00% |  |  |
Goodwill |  | $ 13.0 |  |  |  |  |  |  |  |
Acquisition of businesses, net of cash acquired |  | 5.0 |  |  |  |  |  |  |  |
KEIPER | YFAT |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net purchase consideration |  | $ 23.0 | ¥ 150 |  |  |  |  |  |  |
Asia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 1,168.0 |  |  |  | $ 1,192.0 |  |
Assets Held For Sale | Adient (Langfang) Seating Co., Ltd |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Subsidiary, ownership percentage disposed |  |  |  |  |  |  |  |  |  | 100.00%
Disposed of By Sale | Adient (Langfang) Seating Co., Ltd |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Subsidiary, ownership percentage disposed | 51.00% |  |  |  |  |  |  |  | 51.00% |
Consideration for disposal group | $ 6.0 |  |  |  |  |  |  |  | ¥ 44 |
Deconsolidated cash | 9.0 |  |  |  |  |  |  |  |  |
Loss on disposal | 8.0 |  |  |  |  |  |  |  |  |
Disposed of By Sale | Adient (Langfang) Seating Co., Ltd | Asia |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill | $ 5.0 |  |  |  |  |  |  |  |  |

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