Employee Benefit Plans (Schedule Of Net Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Pension Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	$ 39,049	$ 38,976
Interest cost	1,570	1,554	$ 1,500
Actuarial (gain) loss	4,119	(251)
Benefits paid	(1,256)	(1,230)
Benefit obligation at end of year	43,482	39,049	38,976
Change in plan assets:
Fair value of plan assets at beginning of year	23,399	24,785
Actual return on plan assets	1,768	(561)
Employer contributions	408	405
Benefits paid	(1,256)	(1,230)
Fair value of plan assets at end of year	24,319	23,399	24,785
Funded status at end of year	(19,163)	(15,650)
Other Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	1,013	1,299
Service cost	60	51	62
Interest cost	38	32	51
Actuarial (gain) loss	160	(347)
Benefits paid	(47)	(22)
Benefit obligation at end of year	1,224	1,013	$ 1,299
Change in plan assets:
Employer contributions	47	22
Benefits paid	(47)	(22)
Funded status at end of year	$ (1,224)	$ (1,013)