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Postretirement Benefits - Funded Status (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Benefit obligation	$ 13,851	$ 11,915	$ 11,144
Fair value of plan assets	7,500	6,574	$ 7,078
Unfunded projected benefit obligation	$ (6,351)	$ (5,341)

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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