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v3.20.4

Indebtedness - Debt Outstanding (Parenthetical) (Detail) | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | --- | ---
4.875% Senior Notes Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 4.875% |  | 4.875% |
5.00% Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% | 5.00%
5.00% Senior Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% |
5.75% Senior Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.75% | 5.75% | 5.75% | 5.75%
5.875% Senior Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.875% | 5.875% | 5.875% | 5.875%
9.25% Senior Notes Due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 9.25% |  | 9.25% |
5.00% Senior Subordinated Notes Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.00% | 5.00% | 5.00% |
5.00% Senior Subordinated Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.00% |  | 5.00% |
5.75% Senior Subordinated Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 5.75% | 5.75% | 5.75% |
Notes Payable to Banks |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Bank debt percentage | 2.20% |  | 2.20% |

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