Retirement Plan And Other Post-Retirement Benefits (Narrative) (Details)	6 Months Ended
	Mar. 31, 2016 USD ($)
Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's contributions	$ 4,000,000
Estimated future contributions in remainder of fiscal year	0
VEBA Trusts And 401(h) Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's contributions	1,800,000
Estimated future contributions in remainder of fiscal year	$ 800,000