Pension Plans (Details) (Defined Benefit Pension Plans, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Defined Benefit Pension Plans
Components of net pension costs
Service cost	$ 127	$ 137	$ 381	$ 411
Interest cost	2,389	2,345	7,167	7,035
Expected return on plan assets	(2,521)	(2,494)	(7,563)	(7,482)
Amortization of prior service cost	(16)	(13)	(48)	(39)
Amortization of actuarial loss	413	259	1,239	777
Administrative expenses	21	21	63	63
Net pension cost	$ 413	$ 255	$ 1,239	$ 765