Retirement Plan And Other Post-Retirement Benefits (Narrative) (Details) (USD $) In Millions	9 Months Ended
	Jun. 30, 2011
Minimum [Member] | Retirement Plan [Member]
Estimated Future Contributions in remainder of fiscal year	$ 8.0
Minimum [Member] | VEBA Trusts and 401(h) Accounts [Member]
Estimated Future Contributions in remainder of fiscal year	1.0
Maximum [Member] | Retirement Plan [Member]
Estimated Future Contributions in remainder of fiscal year	9.0
Maximum [Member] | VEBA Trusts and 401(h) Accounts [Member]
Estimated Future Contributions in remainder of fiscal year	6.5
Retirement Plan [Member]
Retirement Plan Contributions by Employer	40.0
VEBA Trusts and 401(h) Accounts [Member]
Retirement Plan Contributions by Employer	$ 18.9