Commitments and Contingencies (Schedule of Letters of Credit and Surety Bonds) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
Other Commitments [Line Items]
Revolving credit capacity	$ 60,000	$ 60,000
Remaining revolving credit capacity	51,240	50,683
Payments for Legal Settlements, Expected	8,500
Surety Bond
Other Commitments [Line Items]
Surety capacity	262,135	261,959
Surety issuances	136,862	134,037
Remaining surety available	$ 125,273	127,922
Minimum | Surety Bond
Other Commitments [Line Items]
Letter of Credit, Guarantee, Bond Commitments, Expiration Period	12 months
Maximum | Surety Bond
Other Commitments [Line Items]
Letter of Credit, Guarantee, Bond Commitments, Expiration Period	10 years
Letter of Credit
Other Commitments [Line Items]
Outstanding letters of credit		$ 9,317
Debt Instrument, Maturity Date	Mar. 20, 2030