Comprehensive Income (Loss) and Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Reclassifications out of accumulated other comprehensive income
Tax (expense) or benefit	$ 10,421	$ 26,813	$ 18,270
Total reclassification for the period	(5,801)	(4,451)
Reclassifications out of accumulated other comprehensive income
Reclassifications out of accumulated other comprehensive income
Prior Service Costs	4,981	4,981
Actuarial (losses)	(13,906)	(11,830)
Total before tax	(8,925)	(6,849)
Tax (expense) or benefit	3,124	2,398
Total reclassification for the period	(5,801)	(4,451)
Defined Benefit Plans | Pension Plan
Reclassifications out of accumulated other comprehensive income
Total reclassification for the period	(7,148)	(6,395)
Defined Benefit Plans | Pension Plan | Reclassifications out of accumulated other comprehensive income
Reclassifications out of accumulated other comprehensive income
Prior Service Costs	(808)	(808)
Actuarial (losses)	(10,189)	(9,031)
Total before tax	(10,997)	(9,839)
Tax (expense) or benefit	3,849	3,444
Total reclassification for the period	(7,148)	(6,395)
Defined Benefit Plans | Post-retirement Plan
Reclassifications out of accumulated other comprehensive income
Total reclassification for the period	1,347	1,944
Defined Benefit Plans | Post-retirement Plan | Reclassifications out of accumulated other comprehensive income
Reclassifications out of accumulated other comprehensive income
Prior Service Costs	5,789	5,789
Actuarial (losses)	(3,717)	(2,799)
Total before tax	2,072	2,990
Tax (expense) or benefit	(725)	(1,046)
Total reclassification for the period	$ 1,347	$ 1,944