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v3.19.1

Goodwill and Other Intangible Assets - Additional Information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 segment | Mar. 31, 2019 segment
Goodwill [Line Items] |  |
Number of reportable segments | 3 | 3
Minimum |  |
Goodwill [Line Items] |  |
Weighted average cost of capital | 14.50% | 14.50%
Maximum |  |
Goodwill [Line Items] |  |
Weighted average cost of capital | 17.50% | 17.50%

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- Definition Goodwill, Reporting Unit, Weighted Average Cost of Capital + References No definition available. + Details
Name: | adnt_GoodwillReportingUnitWeightedAverageCostofCapital
Namespace Prefix: | adnt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |