Retirement and Other Benefit Plans - Schedule Of Funded Status (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Retirement and Other Benefit Plans
Funded status at end of year	$ (22,900)	$ (16,500)
Accrued benefit cost	(22,900)	(16,500)
Current liability	(200)	(200)
Noncurrent liability	(22,682)	(16,286)
Accumulated other comprehensive (income)/loss (before tax effect)	49,600	41,900
Net actuarial loss	49,600	41,900
Accumulated other comprehensive (income)/loss (before tax effect)	$ 49,600	$ 41,900