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v3.21.2

Long-Term Debt - Narrative (Details) | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 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 |
U.S. Revolver |  |  |
Line Of Credit Facility [Line Items] |  |  |
Percentage of voting capital stock pledged as collateral | 100.00% |  |
Non-domestic subsidiaries of voting capital stock | 65.00% |  |
U.S. Revolver | Amended and Restated Credit Agreement |  |  |
Line Of Credit Facility [Line Items] |  |  |
Revolving credit facility | $ 75,000,000.0 |  |
Cash collateral pledged balance | 30,000,000 |  |
Letters of credit collateral amount, minimum outstanding | 0 |  |
Revolving credit facility borrowings, outstanding amount | 0 |  |
Amount available under the credit facility | $ 35,100,000 |  |
Debt covenant, consolidated leverage ratio (less than) | 3.0 |  |
Debt covenant, consolidated interest coverage ratio (greater than) | 3.0 |  |
U.S. Revolver | Amended and Restated Credit Agreement | Fed Funds Rate |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 0.50% |  |
U.S. Revolver | Amended and Restated Credit Agreement | LIBOR |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.00% |  |
U.S. Revolver | Amended and Restated Credit Agreement | Base Rate | Minimum |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | (0.25%) |  |
U.S. Revolver | Amended and Restated Credit Agreement | Base Rate | Maximum |  |  |
Line Of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.75% |  |
U.S. Revolver | Amended and Restated Credit Agreement | Financial Standby Letter of Credit |  |  |
Line Of Credit Facility [Line Items] |  |  |
Guarantee liability | $ 39,900,000 |  |
Industrial Development Revenue Bonds |  |  |
Line Of Credit Facility [Line Items] |  |  |
Borrowings |  |  | $ 8,000,000.0
Interest rate | 0.13% |  |

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