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Retirement Plan And Other Post-Retirement Benefits (Tables)
3 Months Ended
Dec. 31, 2022
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost (Income) Components of Net Periodic Benefit Cost (in thousands):
 
 Retirement PlanOther Post-Retirement Benefits
Three Months Ended December 31,2022202120222021
Service Cost$1,297 $2,190 $147 $332 
Interest Cost10,629 5,707 3,912 2,267 
Expected Return on Plan Assets(16,648)(13,074)(6,403)(7,340)
Amortization of Prior Service Cost (Credit)109 134 (107)(107)
Amortization of (Gains) Losses(1,920)6,601 (2,189)(1,903)
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
5,378 4,420 3,820 6,246 
Net Periodic Benefit Cost (Income)$(1,155)$5,978 $(820)$(505)
(1)The Company’s policy is to record retirement plan and other post-retirement benefit costs in the Utility segment on a volumetric basis to reflect the fact that the Utility segment experiences higher throughput of natural gas in the winter months and lower throughput of natural gas in the summer months.