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Net Periodic Benefit Cost - Narrative (Details)
$ in Thousands
3 Months Ended
Dec. 31, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected future employer contributions $ 6,908
Pension Plans, Defined Benefiit  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, net periodic benefit cost due to settlement $ 4,599