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Retirement Plan And Other Post-Retirement Benefits (Tables)
 6 Months Ended
Mar. 31, 2025
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 March 31,2025202420252024
Service Cost$1,023 $1,049 $130 $109 
Interest Cost9,223 10,890 3,625 3,890 
Expected Return on Plan Assets(14,647)(17,086)(6,536)(6,660)
Amortization of Prior Service Cost (Credit)76 91 (107)(107)
Amortization of (Gains) Losses1,620 (335)9 (567)
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
(2,946)4,057 (4,158)1,769 
Net Periodic Benefit Cost (Income)$(5,651)$(1,334)$(7,037)$(1,566)
 Retirement PlanOther Post-Retirement Benefits
Six Months Ended March 31,2025202420252024
Service Cost$2,046 $2,098 $259 $217 
Interest Cost18,446 21,779 7,251 7,780 
Expected Return on Plan Assets(29,293)(34,172)(13,072)(13,321)
Amortization of Prior Service Cost (Credit)151 181 (214)(214)
Amortization of (Gains) Losses3,240 (669)18 (1,133)
Net Amortization and Deferral for Regulatory Purposes (Including Volumetric Adjustments) (1)
(3,111)8,116 (4,885)4,008 
Net Periodic Benefit Cost (Income)$(8,521)$(2,667)$(10,643)$(2,663)
(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.