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Retirement Plan And Other Post-Retirement Benefits
 9 Months Ended
Jun. 30, 2022
Retirement Benefits [Abstract]  
Retirement Plan and Other Post-Retirement Benefits Retirement Plan and Other Post-Retirement Benefits
 
    Components of Net Periodic Benefit Cost (in thousands):
 
 Retirement PlanOther Post-Retirement Benefits
Three Months Ended June 30,2022202120222021
Service Cost$2,190 $2,466 $332 $400 
Interest Cost5,707 5,422 2,267 2,326 
Expected Return on Plan Assets(13,074)(14,537)(7,340)(7,241)
Amortization of Prior Service Cost (Credit)134 158 (107)(107)
Amortization of (Gains) Losses6,601 9,203 (1,903)212 
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
3,470 2,772 5,351 6,639 
Net Periodic Benefit Cost (Income)$5,028 $5,484 $(1,400)$2,229 
 Retirement PlanOther Post-Retirement Benefits
Nine Months Ended June 30,2022202120222021
Service Cost$6,568 $7,399 $996 $1,202 
Interest Cost17,121 16,265 6,800 6,977 
Expected Return on Plan Assets(39,221)(43,611)(22,020)(21,723)
Amortization of Prior Service Cost (Credit)403 473 (321)(321)
Amortization of (Gains) Losses19,803 27,610 (5,708)636 
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
16,308 14,194 15,870 22,942 
Net Periodic Benefit Cost (Income)$20,982 $22,330 $(4,383)$9,713 
(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.
 
    The components of net periodic benefit cost other than service cost are presented in Other Income (Deductions) on the Consolidated Statements of Income.
Employer Contributions.    During the nine months ended June 30, 2022, the Company contributed $19.3 million to its tax-qualified, noncontributory defined-benefit retirement plan (Retirement Plan) and $2.7 million to its VEBA trusts for its other post-retirement benefits.  In the remainder of 2022, the Company expects to contribute approximately $1.1 million to the Retirement Plan. In the remainder of 2022, the Company expects to contribute approximately $0.2 million to its VEBA trusts.