INCOME TAXES - Narratives (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Income Tax Contingency [Line Items] | ||
| Net operating losses | $ 58 | $ 59 |
| US and non-US Tax Credit Carryforward | $ 3 | |
| US and non-US tax credit carryforward expiration period | 2027 | |
| State | ||
| Income Tax Contingency [Line Items] | ||
| Net operating losses | $ 620 | |
| Minimum | ||
| Income Tax Contingency [Line Items] | ||
| Operating Loss Carryforwards, Expiration Year | 2027 | |
| Maximum | ||
| Income Tax Contingency [Line Items] | ||
| Operating Loss Carryforwards, Expiration Year | 2046 | |
| GERMANY | Foreign Country Jurisdiction | ||
| Income Tax Contingency [Line Items] | ||
| Net operating losses | $ 87 | |
| UNITED KINGDOM | Foreign Country Jurisdiction | ||
| Income Tax Contingency [Line Items] | ||
| Net operating losses | $ 52 |