Retirement Plan And Other Post-Retirement Benefits (Narrative) (Details) (USD $)	6 Months Ended
	Mar. 31, 2015
Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's contributions	$ 18,000,000
VEBA Trusts And 401(h) Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's contributions	1,500,000
Estimated future contributions in remainder of fiscal year	500,000.0
Minimum [Member] | Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future contributions in remainder of fiscal year	0
Maximum [Member] | Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future contributions in remainder of fiscal year	$ 2,000,000