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Subsequent Events - Minimum Units Manufactured (Details) - Fourth Admendment to Credit Agreement - Credit Facility - Subsequent Event	Nov. 24, 2021 school_bus
Limited Availability Period One
Debt Instrument [Line Items]
Minimum Units Manufactured	1,128
Limited Availability Period Two
Debt Instrument [Line Items]
Minimum Units Manufactured	776
Limited Availability Period Three
Debt Instrument [Line Items]
Minimum Units Manufactured	748
Limited Availability Period Four
Debt Instrument [Line Items]
Minimum Units Manufactured	727
Limited Availability Period Five
Debt Instrument [Line Items]
Minimum Units Manufactured	763
Limited Availability Period Six
Debt Instrument [Line Items]
Minimum Units Manufactured	1,111
Limited Availability Period Seven
Debt Instrument [Line Items]
Minimum Units Manufactured	1,525
Limited Availability Period Eight
Debt Instrument [Line Items]
Minimum Units Manufactured	2,053
Limited Availability Period Nine
Debt Instrument [Line Items]
Minimum Units Manufactured	2,072
Limited Availability Period Ten
Debt Instrument [Line Items]
Minimum Units Manufactured	2,199
Limited Availability Period Eleven
Debt Instrument [Line Items]
Minimum Units Manufactured	2,306

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Debt Instrument, Covenant, Units Manufactured, Minimum

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