Employee Benefit Plans (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Net periodic benefit cost for the period, a reconciliation of the changes in the Plan assets, projected benefit obligations, and the amounts recognized in other comprehensive income and accumulated other comprehensive income
Fair Value of Pension Plan Assets, Ending Balance	$ 60,303
Frozen Defined Benefit Pension Plans [Member]
Net periodic benefit cost for the period, a reconciliation of the changes in the Plan assets, projected benefit obligations, and the amounts recognized in other comprehensive income and accumulated other comprehensive income
Fair Value of Pension Plan Assets, Beginning Balance	52,434	49,323	37,587
Projected Benefit Obligation, Beginning Balance	(67,878)	(65,922)	(62,265)
Gross Pension Related Accumulated Other Comprehensive Income, Beginning Balance	33,041	33,212	31,235
Net Periodic Pension Cost in Income Statement, Interest cost	2,858	2,993	3,250
Projected Benefit Obligation, Interest cost	(2,858)	(2,993)	(3,250)
Net Periodic Pension Cost in Income Statement, Actual return on plan assets	(8,727)	(3,984)	(2,666)
Fair Value of Pension Plan Assets, Actual return on plan assets	8,727	3,984	2,666
Cash, Employer contributions/ Annual cost/change	(3,365)	(3,224)	(13,107)
Fair Value of Pension Plan Assets, Employer contributions	3,365	3,224	13,107
Fair Value of Pension Plan Assets, Benefit payments	(4,223)	(4,097)	(4,037)
Projected Benefit Obligation, Benefit payments	4,223	4,097	4,037
Net Periodic Pension Cost in Income Statement, Investment and other expenses	(374)	(377)	(460)
Projected Benefit Obligation, Investment and other expenses	374	377	460
Net Periodic Pension Cost in Income Statement, Difference between actual and expected return on plan assets	5,075	597	276
Other Comprehensive (Income) / Loss, Difference between actual and expected return on plan assets	(5,075)	(597)	(276)
Net Periodic Pension Cost in Income Statement, Anticipated expenses	262	246	188
Projected Benefit Obligation, Anticipated expenses	(262)	(246)	(188)
Projected Benefit Obligation, Actuarial loss	(6,650)	(3,191)	(4,716)
Other Comprehensive (Income) / Loss, Actuarial loss	6,650	3,191	4,716
Net Periodic Pension Cost in Income Statement, Amortization of unrecognized net actuarial loss	2,751	2,765	2,463
Other Comprehensive (Income) / Loss, Amortization of unrecognized net actuarial loss	(2,751)	(2,765)	(2,463)
Net Periodic Pension Cost in Income Statement, Annual cost/change	1,845	2,240	3,051
Fair Value of Pension Plan Assets, Annual cost/change	7,869	3,111	11,736
Projected Benefit Obligation, Annual cost/change	(5,173)	(1,956)	(3,657)
Other Comprehensive (Income) / Loss & Gross Pension Related Accumulated Other Comprehensive Income, Annual cost/change	(1,176)	(171)	1,977
Fair Value of Pension Plan Assets, Ending Balance	60,303	52,434	49,323
Projected Benefit Obligation, Ending Balance	(73,051)	(67,878)	(65,922)
Gross Pension Related Accumulated Other Comprehensive Income, Ending Balance	31,865	33,041	33,212
Funded status at the end of the year	$ (12,748)	$ (15,444)	$ (16,599)