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Commitments and Contingencies and Derivative Financial Instruments (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 30, 2022 USD ($) | Sep. 30, 2022 USD ($) derivative_agreement | Sep. 29, 2023 USD ($) | Dec. 22, 2008 case
Fixed Rate Date | Forecast |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 500,000,000 |
Treasury Lock |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of instruments held | derivative_agreement |  | 2 |  |
Derivative notional amount |  | $ 500,000,000 |  |
Derivative assets (liabilities), at fair value | $ 41,500,000 | 40,900,000 |  |
Unrealized gain (loss) on derivatives | 30,800,000 | 31,300,000 |  |
Interest Rate Swap and Cross Currency Interest Rate Contract |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Derivative assets (liabilities), at fair value | 108,000,000 | 128,200,000 |  |
Unrealized gain (loss) on derivatives | 80,200,000 | 87,500,000 |  |
Interest Rate Swap |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Derivative notional amount | 766,700,000 |  |  |
Cross Currency Interest Rate Contract |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Derivative notional amount | 127,800,000 |  |  |
Foreign Exchange Forward |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Derivative notional amount | 382,500,000 | 298,200,000 |  |
Derivative assets (liabilities), at fair value | $ 12,100,000 | (3,200,000) |  |
Minimum | Cross Currency Interest Rate Contract |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Term of derivative contract | 3 years 6 months |  |  |
Minimum | Foreign Exchange Forward |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Term of derivative contract | 1 month |  |  |
Maximum | Cross Currency Interest Rate Contract |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Term of derivative contract | 10 years |  |  |
Maximum | Foreign Exchange Forward |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Term of derivative contract | 12 months |  |  |
Kingston Power Plant of the TVA, Secondary Case No. 3:13CV-505-TAV-HBG |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of pending claims | case |  |  |  | 10
LOCs |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Aggregate principal balance of short-term debt | $ 292,500,000 | 280,500,000 |  |
Surety Bond |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Aggregate principal balance of short-term debt | $ 2,000,000,000 | $ 2,200,000,000 |  |

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