| Debt and Financing Arrangements - Long-Term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021 | 
|---|---|---|
| Debt Instrument [Line Items] | ||
| Total debt | $ 752,964 | $ 763,710 | 
| Finance lease obligations | 7,161 | 9,177 | 
| Less current maturities | (3,872) | (4,624) | 
| Long-term debt | 749,092 | 759,086 | 
| 2025 Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Total debt | 298,065 | 297,796 | 
| Other borrowings | ||
| Debt Instrument [Line Items] | ||
| Total debt | 58,522 | 10,150 | 
| Revolving credit facilities | Line of Credit | ||
| Debt Instrument [Line Items] | ||
| Total debt | 389,216 | 350,597 | 
| Securitization facility | ||
| Debt Instrument [Line Items] | ||
| Total debt | $ 0 | $ 95,990 | 
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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, including portion classified as current. No definition available. 
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