Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - Estimate of Fair Value Measurement [Member] - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Assets:
Total fair value	$ 219,971	$ 218,321
Defined Benefit Pension Plan
Assets:
Total fair value	219,971	218,321
Fair Value, Inputs, Level 1 [Member]
Assets:
Total fair value	32,155	15,926
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Pension Plan
Assets:
Total fair value	32,155	15,926
Fair Value, Inputs, Level 2 [Member]
Assets:
Total fair value	154,686	158,582
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Pension Plan
Assets:
Total fair value	154,686	158,582
NAV
Assets:
Total fair value	33,130	43,813
NAV | Defined Benefit Pension Plan
Assets:
Total fair value	$ 33,130	$ 43,813