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v3.24.3

Organization and Summary of Significant Accounting Policies - Narratives (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 USD ($) entity | Sep. 30, 2023 USD ($) entity | Sep. 30, 2022 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Number of VIE entities | entity | 2 | 2 |
Amount funded under accounts receivable repurchase program | $ 170 | $ 170 |
Engineering, research and development, and other design and development costs | 310 | 274 |
Research and development costs | 372 | 362 | $ 322
Research and development costs reimbursed by customers | 280 | 250 | 194
Foreign currency translation gain (loss) | $ (3) | $ 4 | $ 6
Volkswagen Group | Net sales | Customer concentration risk |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Concentration risk (as percent) | 13.00% | 11.00% |
Ford Motor Company | Net sales | Customer concentration risk |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Concentration risk (as percent) | 12.00% | 11.00% |
Stellantis N.V. | Net sales | Customer concentration risk |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Concentration risk (as percent) |  | 10.00% | 12.00%
Minimum | Buildings and improvements |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Useful life | 3 years |  |
Minimum | Machinery and equipment |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Useful life | 3 years |  |
Maximum | Buildings and improvements |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Useful life | 40 years |  |
Maximum | Machinery and equipment |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Useful life | 15 years |  |
Current assets |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Engineering, research and development, and other design and development costs | $ 108 | $ 104 |
Costs for molds, dies and other tools to be reimbursed by customer | 156 | 151 |
Other Noncurrent Assets |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Engineering, research and development, and other design and development costs | 202 | 170 |
Costs for molds, dies and other tools to be reimbursed by customer | 25 | 11 |
Property, plant and equipment |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Costs for molds, dies and other tools with title | $ 50 | $ 53 |

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