Segment Information - Schedule of Financial Information for Reportable Segments (Details) $ in Millions	3 Months Ended
Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Oct. 31, 2023
Segment Reporting [Abstract]
Number of reportable segments \| segment	3
Segment Reporting Information [Line Items]
Net sales	$ 3,660.0	$ 3,699.0
Corporate-related costs	(7.0)	1.0
Restructuring and impairment costs	(11.0)	(7.0)
Purchase accounting amortization	(11.0)	(12.0)
Restructuring related charges	9.0	(3.0)
Depreciation	(72.0)	(69.0)
Stock based compensation	(13.0)	(8.0)
Earnings before interest and income taxes	111.0	114.0
Net financing charges	(44.0)	(41.0)
Other pension income (expense)	(2.0)	(9.0)
Income before income taxes	65.0	64.0
One-time divestiture related tax impact at an affiliate	2.0
Gain on contract settlement	3.0	1.0
Integration-related costs		1.0
Net actuarial and settlement/curtailment (gain) loss	0.0	(8.0)
Assets Held For Sale \| Adient (Langfang) Seating Co., Ltd
Segment Reporting Information [Line Items]
Subsidiary, ownership percentage disposed			100.00%
Restatement Adjustment
Segment Reporting Information [Line Items]
Stock based compensation	(5.0)
Brazil
Segment Reporting Information [Line Items]
One-time gain		1.0
Americas
Segment Reporting Information [Line Items]
Net sales	1,647.0	1,724.0
Gain (loss) on disposition of property plant equipment	10.0
Americas
Segment Reporting Information [Line Items]
Net actuarial and settlement/curtailment (gain) loss		8.0
Operating Segments \| Americas
Segment Reporting Information [Line Items]
Net sales	1,647.0	1,724.0
Adjusted EBITDA	80.0	69.0
Operating Segments \| EMEA
Segment Reporting Information [Line Items]
Net sales	1,268.0	1,182.0
Adjusted EBITDA	45.0	28.0
Operating Segments \| Asia
Segment Reporting Information [Line Items]
Net sales	770.0	821.0
Adjusted EBITDA	114.0	138.0
Eliminations
Segment Reporting Information [Line Items]
Net sales	(25.0)	(28.0)
Eliminations \| Americas
Segment Reporting Information [Line Items]
Net sales	(493.0)	(531.0)
Corporate-related costs
Segment Reporting Information [Line Items]
Corporate-related costs	$ (23.0)	$ (23.0)

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