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v3.20.2

Long-Term Debt - Narrative (Details) | Sep. 27, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Oct. 31, 2001 USD ($)
--- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |
Revolving credit facility borrowings, outstanding amount |  | $ 800,000 | $ 1,200,000 |
Industrial Development Revenue Bonds |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowings |  |  |  | $ 8,000,000.0
Reimbursement agreement requires annual redemptions |  | $ 400,000 |  |
Interest rate |  | 0.27% |  |
Amended And Restated Credit Agreement | U.S. Revolver |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Revolving credit facility | $ 75,000,000.0 |  |  |
Revolving credit facility borrowings, outstanding amount |  | $ 0 |  |
Amount of credit facility remaining borrowing capacity |  | $ 36,300,000 |  |
Debt covenant, consolidated leverage ratio (less than) | 3.0 |  |  |
Debt covenant, consolidated interest coverage ratio (greater than) | 3.0 |  |  |
Cash collateral pledged balance | $ 30,000,000 |  |  |
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%) |  |  |

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