Retirement Benefit Plans (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Benefit obligations:
Benefit obligations at beginning of year	$ 24,030	$ 21,889
Service cost	266	273
Interest cost	988	1,059
Amendments	0	0
Actuarial loss	2,659	1,821
Benefits paid	(1,637)	(1,073)
Early retirement expense	0	61
Benefit obligations at end of year	26,306	24,030
Plan assets:
Balance at beginning of year	16,642	16,653
Actual return on plan assets	2,929	364
Employer contributions	1,015	698
Benefits paid	(1,637)	(1,073)
Balance at end of year	$ 18,949	$ 16,642