Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - Estimate of Fair Value Measurement [Member] - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Assets:
Total fair value	$ 218,321	$ 297,703
Defined Benefit Pension Plan
Assets:
Total fair value	218,321	297,703
Fair Value, Inputs, Level 1 [Member]
Assets:
Total fair value	15,926	23,654
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Pension Plan
Assets:
Total fair value	15,926	23,654
Fair Value, Inputs, Level 2 [Member]
Assets:
Total fair value	158,582	169,953
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Pension Plan
Assets:
Total fair value	158,582	169,953
NAV
Assets:
Total fair value	43,813	104,096
NAV | Defined Benefit Pension Plan
Assets:
Total fair value	$ 43,813	$ 104,096