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Commitments and Contingencies (Tables)
 3 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Line 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 December 31, 2021 and September 30, 2021.
December 31,
2021		September 30,
2021
Borrowing availability$350,000 $350,000 
Outstanding borrowings27,000 37,000 
Outstanding letters of credit9,828 10,112 
Unused amounts$313,172 $302,888 
The following summarizes the Company’s outstanding letters of credit and surety bonds as of December 31, 2021 and September 30, 2021, respectively.
December 31,
2021		September 30,
2021
Revolving credit capacity$60,000 $60,000 
Letters of credit outstanding9,828 10,112 
Remaining revolving credit capacity$50,172 $49,888 
Surety capacity$250,000 $250,000 
Surety issuances142,709 147,845 
Remaining surety available$107,291 $102,155