Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-37757
Entity Registrant Name	Adient plc
Entity Incorporation, State or Country Code	L2
Entity Tax Identification Number	98-1328821
Entity Address, Address Line One	25-28 North Wall Quay
Entity Address, Address Line Two	IFSC
Entity Address, City or Town	Dublin 1
Entity Address, Country	IE
Entity Address, Postal Zip Code	D01 H104
City Area Code	734
Local Phone Number	254-5000
Title of 12(b) Security	Ordinary Shares, par value $0.001
Trading Symbol	ADNT
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float		$ 1.2
Entity Common Stock, Shares Outstanding	93,620,714
Entity Central Index Key	0001670541
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2019
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	FY
Amendment Flag	false