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Investments in Unconsolidated Affiliates - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Schedule Of Equity Method Investments [Line Items] |  |  |
Equity method investment ownership percentage | 20.00% |  |
Mezcladores Trailers De Mexico S A De C V |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Equity method investment ownership percentage | 49.00% |  |
Equity method investment amount sale | $ 3.4 | $ 3.3 | $ 3.6
Equity method investments service fees | $ 0.8 | $ 1.1 | $ 1.4
Maximum |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Equity method investment ownership percentage | 20.00% |  |

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