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Debt (Schedule of Line of Credit Facilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Line of Credit Facility [Line Items]    
Line of credit facility, remaining borrowing capacity $ 60,000 $ 45,000
Outstanding borrowings 754,943 885,470
Unused amounts $ 49,888 32,037
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 
  
Letter of Credit    
Line of Credit Facility [Line Items]    
Letters of credit outstanding, amount $ 10,112 12,963
Unused amounts 302,888 112,037
2014 Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Line of credit facility, remaining borrowing capacity 350,000 125,000
2014 Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Outstanding borrowings 0 0
Line of Credit | Letter of Credit    
Line of Credit Facility [Line Items]    
Letters of credit outstanding, amount $ 0 $ 52