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Interim Pension and Other Postretirement Benefit Plan Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Contribution to postretirement medical plans     $ 11,100  
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4,323 $ 4,609 12,970 $ 13,834
Interest cost 5,063 5,016 15,190 15,072
Expected return on assets (7,383) (6,978) (22,149) (20,934)
Amortization of prior service cost (credit) (58) (58) (174) (174)
Amortization of actuarial (gain) loss 1,951 3,062 5,853 9,405
Settlements 0 8,999 0 8,999
Net periodic pension cost 3,896 14,650 11,690 26,202
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2,559 4,305 7,676 12,917
Interest cost 2,683 2,661 8,050 7,981
Expected return on assets (3,312) (2,613) (9,937) (7,841)
Amortization of prior service cost (credit) (3,308) 44 (9,925) 130
Amortization of actuarial (gain) loss 0 0 0 0
Settlements 0 0 0 0
Net periodic pension cost (1,378) $ 4,397 (4,136) $ 13,187
Minimum | Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Expected future contributions 15,000   15,000  
Maximum | Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Expected future contributions $ 25,000   $ 25,000