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Retirement Plan And Other Post-Retirement Benefits
 9 Months Ended
Jun. 30, 2024
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 30,2024202320242023
Service Cost$1,049 $1,297 $109 $147 
Interest Cost10,890 10,629 3,890 3,912 
Expected Return on Plan Assets(17,086)(16,648)(6,660)(6,403)
Amortization of Prior Service Cost (Credit)91 109 (107)(107)
Amortization of (Gains) Losses(335)(1,920)(567)(2,189)
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
4,057 5,378 2,248 3,829 
Net Periodic Benefit Cost (Income)$(1,334)$(1,155)$(1,087)$(811)
 Retirement PlanOther Post-Retirement Benefits
Nine Months Ended June 30,2024202320242023
Service Cost$3,148 $3,891 $326 $440 
Interest Cost32,668 31,887 11,671 11,736 
Expected Return on Plan Assets(51,257)(49,945)(19,981)(19,210)
Amortization of Prior Service Cost (Credit)271 327 (322)(321)
Amortization of (Gains) Losses(1,004)(5,760)(1,700)(6,566)
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
12,173 16,134 6,256 11,143 
Net Periodic Benefit Cost (Income)$(4,001)$(3,466)$(3,750)$(2,778)
(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.    The Company did not make any contributions to its tax-qualified, noncontributory defined benefit retirement plan (Retirement Plan) during the nine months ended June 30, 2024, and does not anticipate making any such contributions during the remainder of fiscal 2024. The Company also did not make any contributions to its VEBA trusts for its other post-retirement benefits during the nine months ended June 30, 2024, and does not anticipate making any such contributions during the remainder of fiscal 2024.