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v3.21.2

Long-Term Debt - Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Oct. 01, 2021 USD ($) | Sep. 30, 2020 USD ($) | Oct. 31, 2001 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Revolving credit facility borrowings, outstanding amount | $ 400,000 |  | $ 800,000 |
Industrial Development Revenue Bonds |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowings |  |  |  | $ 8,000,000
Interest rate | 0.14% |  |  |
Industrial Development Revenue Bonds | Subsequent Event |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Final annual redemption |  | $ 400,000 |  |
Amended And Restated Credit Agreement | U.S. Revolver |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Revolving credit facility | $ 75,000,000 |  |  |
Cash collateral pledged balance | 30,000,000 |  |  |
Letters of credit, collateral outstanding (not to be less than) | 0 |  |  |
Revolving credit facility borrowings, outstanding amount | 0 |  |  |
Amount of credit facility remaining borrowing capacity | $ 40,200,000 |  |  |
Debt covenant, consolidated leverage ratio (less than) | 3.0 |  |  |
Debt covenant, consolidated interest coverage ratio (greater than) | 3.0 |  |  |
Percentage of voting capital stock pledged as collateral | 100.00% |  |  |
Non-domestic subsidiaries of voting capital stock | 65.00% |  |  |
Amended And Restated Credit Agreement | U.S. Revolver | Federal Funds Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 0.50% |  |  |
Amended And Restated Credit Agreement | U.S. Revolver | Eurocurrency Rate | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 1.75% |  |  |
Amended And Restated Credit Agreement | U.S. Revolver | LIBOR |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | 1.00% |  |  |
Amended And Restated Credit Agreement | U.S. Revolver | Base Rate | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate | (0.25%) |  |  |
Amended And Restated Credit Agreement | U.S. Revolver | Financial Standby Letter of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Guarantee liability, letters of credit | $ 34,800,000 |  |  |

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