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Commitments and Contingencies (Tables)
 3 Months Ended
Dec. 31, 2020
Commitments and Contingencies 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