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v3.20.2

Indebtedness (Narrative) (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 08, 2019 USD ($) extnsion_option | Sep. 27, 2020 USD ($) | Sep. 29, 2019 USD ($) | Sep. 30, 2018 USD ($) | Apr. 12, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishment of debt |  | $ 0 | $ 2,757,000 | $ 0 |
Securitization Transaction |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Deferred financing costs | $ 33,000,000.0 |  |  |  |
Senior Notes | Class A-2-I Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of secured debt | $ 575,000,000.0 |  |  |  |
Interest rate | 3.982% |  |  |  |
Senior secured notes |  | $ 570,688,000 | 575,000,000 |  |
Effective interest rate |  | 4.544% |  |  |
Senior Notes | Class A-2-II Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of secured debt | $ 275,000,000.0 |  |  |  |
Interest rate | 4.476% |  |  |  |
Senior secured notes |  | $ 272,938,000 | 275,000,000 |  |
Effective interest rate |  | 4.80% |  |  |
Senior Notes | Class A-2-III Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of secured debt | $ 450,000,000.0 |  |  |  |
Interest rate | 4.97% |  |  |  |
Senior secured notes |  | $ 446,625,000 | 450,000,000 |  |
Effective interest rate |  | 5.197% |  |  |
Senior Notes | Class A-2 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 150,000,000.0 |  |  |  |
Quarterly principal payment |  | $ 3,250,000 |  |  |
Specified maximum leverage ratio | 5.0 | 5.0 |  |  |
Number of extensions for variable funding notes | extnsion_option | 2 |  |  |  |
Interest rate after repayment date | 5.00% |  |  |  |
Length of extension period | 1 year |  |  |  |
Letters of credit outstanding, amount |  | $ 39,500,000 | $ 45,600,000 |  |
Senior secured notes |  | 107,900,000 |  |  | $ 107,900,000
Unused borrowing capacity |  | 2,700,000 |  |  |
Senior Notes | Maximum | Class A-2 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Scaled commitment fee (percent) | 1000.00% |  |  |  |
Senior Notes | Minimum | Class A-2 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Scaled commitment fee (percent) | 500.00% |  |  |  |
Interest expense, net |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishment of debt |  | $ 2,800,000 |  |  |

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