Note 1, Significant Accounting Policies (Policies)	9 Months Ended
Note 1, Significant Accounting Policies (Policies)	Jun. 30, 2017
Variable Interest Entity [Line Items]
Variable Interest Entity Disclosure [Text Block]	Consolidated VIEs Based upon the criteria set forth in the Financial Accounting Standards Board (the FASB) Accounting Standards Codification (ASC) 810, "Consolidation," Adient has determined that it was the primary beneficiary in two variable interest entities (VIEs) for the reporting periods ended June 30, 2017 and September 30, 2016, as Adient absorbs significant economics of the entities and has the power to direct the activities that are considered most significant to the entities. The two VIEs manufacture seating products in North America for the automotive industry. Adient funds the entities' short-term liquidity needs through revolving credit facilities and has the power to direct the activities that are considered most significant to the entities through its key customer supply relationships.
Basis of Presentation and Significant Accounting Policies [Text Block]	Basis of Presentation The financial statements for periods prior to October 31, 2016 were prepared on a stand-alone combined basis derived from the consolidated financial statements and accounting records of JCI as if Adient had been operating as a stand-alone company for all periods presented. These financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP"). The assets and liabilities in the financial statements have been reflected on a historical cost basis, as included in the consolidated statements of financial position of JCI. The statements of income include allocations for certain support functions that were provided on a centralized basis by the former Parent and subsequently recorded at the business unit level, such as expenses related to employee benefits, finance, human resources, risk management, information technology, facilities, and legal, among others. These expenses have been allocated to Adient on the basis of direct usage when identifiable, with the remainder allocated on a proportional basis of combined sales, headcount or other measures of Adient or the former Parent. Management believes the assumptions underlying the financial statements, including the assumptions regarding allocating general corporate expenses from JCI, are reasonable. Nevertheless, the financial statements for periods prior to the separation may not include all actual expenses that would have been incurred by Adient and may not reflect the results of operations, financial position and cash flows had it been a stand-alone company during the periods presented. Actual costs that would have been incurred if Adient had been a stand-alone company would depend on multiple factors, including organizational structure and strategic decisions made in various areas, including information technology and infrastructure. The financial statements for periods prior to the separation include certain assets and liabilities that have historically been held at JCI but are specifically identifiable or otherwise attributable to Adient. All significant intercompany transactions and accounts within Adient's businesses have been eliminated. All intercompany transactions between Adient and JCI prior to the separation have been included in the consolidated financial statements as Parent's net investment. Expenses related to corporate allocations from JCI to Adient are considered to be effectively settled for cash in the financial statements at the time the transaction is recorded. In addition, transactions between Adient and JCI's other businesses prior to the separation have been classified as related party, rather than intercompany, in the financial statements. See Note 15, "Related Party Transactions," of the notes to consolidated financial statements for further details. Prior to the separation, transfers of cash to and from JCI's cash management system were reflected as a component of Parent's net investment in the consolidated statements of financial position. For periods prior to the separation, the cash and cash equivalents held by JCI were not attributed to Adient, as legal ownership remained with the former Parent. Furthermore, the income tax expense and deferred taxes in the financial statements for periods prior to October 31, 2016 were prepared on a separate return basis derived from the consolidated financial statements and accounting records of JCI as if Adient had been operating as a stand-alone company for all periods presented. As a standalone entity, Adient will file tax returns on its own behalf and its effective tax rate and deferred taxes may differ from those in historical periods. The accompanying consolidated financial statements presented herein are unaudited and should be read in conjunction with the combined financial statements presented in Adient's 2016 Annual Report on Form 10-K. These consolidated financial statements have been prepared in accordance with U.S. GAAP. Such financial statements reflect all adjustments that, in the opinion of management, are necessary for a fair statement of the results of the interim periods presented; all such adjustments are of a normal recurring nature except for the impacts of adopting new accounting standards as discussed below. All significant intercompany accounts and transactions have been eliminated. The results of operations for the three and nine months ended June 30, 2017 are not necessarily indicative of the results of operations for the year ending September 30, 2017. In addition to wholly-owned subsidiaries, Adient has investments which, in certain cases, may or may not require combination, as a result of only a partial-ownership interest and/or lack of significant influence over the investee. Adient's investments in partially-owned affiliates are accounted for by the equity method when Adient's interest exceeds 20% and Adient does not have a controlling interest.