Debt - Long-Term Debt (Details) - USD ($) $ in Thousands  | 
Dec. 31, 2021  | 
Sep. 30, 2021  | 
|---|---|---|
| Debt Instrument [Line Items] | ||
| Total debt | $ 836,062 | $ 763,710 | 
| Finance lease obligations | 8,145 | 9,177 | 
| Less current maturities | (4,271) | (4,624) | 
| Long-term debt | 831,791 | 759,086 | 
| 2025 Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Total debt | 297,931 | 297,796 | 
| Other borrowings | ||
| Debt Instrument [Line Items] | ||
| Total debt | 20,296 | 10,150 | 
| Revolving Credit Facility | Line of Credit | ||
| Debt Instrument [Line Items] | ||
| Total debt | 405,000 | 350,597 | 
| Securitization Facility | ||
| Debt Instrument [Line Items] | ||
| Total debt | $ 104,690 | $ 95,990 | 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of long-term debt and lease obligation, classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of long-term debt and lease obligation, classified as current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of long-term debt and lease obligation, including portion classified as current. No definition available. 
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