Pension Plans (Details) (Defined Benefit Pension Plans, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Pension Plans
Components of net periodic pension cost (benefit)
Service cost	$ 154	$ 136	$ 306	$ 276
Interest cost	2,485	2,217	4,956	4,461
Expected return on plan assets	(3,287)	(2,900)	(6,556)	(5,834)
Amortization of actuarial loss	199	450	397	907
Administrative expenses	38	19	76	38
Net pension benefit	$ (411)	$ (78)	$ (821)	$ (152)