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Commitments and Contingencies (Tables)
 12 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Credit Facilities
The following table summarizes the amount of the Company’s outstanding borrowings and outstanding letters of credit under the 2021 Revolving Credit Facility as of September 30, 2021, and under the 2014 Revolving Credit Facility as of September 30, 2020.
September 30,
2021		September 30,
2020
Borrowing availability$350,000 $125,000 
Outstanding borrowings37,000 — 
Outstanding letters of credit10,112 12,963 
Unused amounts$302,888 $112,037 
Additional letters of credit under a separate arrangement$— $52 
The following summarizes the Company’s outstanding letters of credit and surety bonds as of September 30, 2021 and September 30, 2020, respectively.
September 30, 2021September 30, 2020
Revolving credit capacity
$60,000 $45,000 
Letters of credit outstanding
10,112 12,963 
Remaining revolving credit capacity
$49,888 $32,037 
Surety capacity
$250,000 $230,000 
Surety issuances
147,845 152,990 
Remaining surety available
$102,155 $77,010