Retirement Plan And Other Post-Retirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2012
Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's contributions	$ 31.8
Estimated future contributions in remainder of fiscal year	12.2
VEBA Trusts And 401(h) Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's contributions	18.9
Maximum [Member] | VEBA Trusts And 401(h) Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future contributions in remainder of fiscal year	3.0
Minimum [Member] | VEBA Trusts And 401(h) Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future contributions in remainder of fiscal year	$ 2.0