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Debt (Tables)
 3 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Line of Credit Facilities
The following summarizes the Company’s outstanding borrowings under the Revolver and outstanding letters of credit as of December 31, 2020 and September 30, 2020, respectively.
December 31,
2020		September 30,
2020
Borrowing availability under the Revolver$125,000 $125,000 
Outstanding borrowings under the Revolver— — 
Outstanding letters of credit under the Revolver11,824 12,963 
Unused amounts under the Revolver$113,176 $112,037 
Additional letters of credit under a separate arrangement$33 $52 
The following summarizes the Company’s outstanding letters of credit and surety bonds as of December 31, 2020 and September 30, 2020, respectively.
December 31,
2020		September 30,
2020
Revolving credit capacity$45,000 $45,000 
Letters of credit outstanding11,824 12,963 
Remaining revolving credit capacity$33,176 $32,037 
Surety capacity$230,000 $230,000 
Surety issuances144,647 152,990 
Remaining surety available$85,353 $77,010 
Schedule of Aggregate Maturities of Long-term Debt
Aggregate maturities of all long‑term debt, including current portion of long‑term debt and excluding finance lease obligations as of December 31, 2020, are presented below:
Fiscal Year
Remainder of 2021$16,440 
202217,002 
202317,295 
2024797,133 
20257,754 
Thereafter
31,928 
Total
$887,552