Retirement Plans (Details) (USD $)	12 Months Ended
	Sep. 30, 2012
Change in benefit obligation:
Benefit obligation at beginning of fiscal year	$ 397,760,000
Service costs	0
Interest costs	20,659,000
Benefits paid	(8,621,000)
Actuarial loss	231,002,000
Benefit obligation at end of fiscal year	640,800,000
Change in plan assets:
Fair value of plan assets at beginning of fiscal year	308,089
Actual return on plan assets	(38,532,000)
Employer contribution	34,421,000
Benefits paid	(8,621,000)
Fair value of plan assets at end of year	295,357
Funded status at end of year	$ (345,443,000)