Defined Benefit Pension and Other Postretirement Plans (Details) - USD ($)	6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Benefits
Defined Benefit Plan Disclosure
Contribution made to Pension Plan	$ 4,934,000	$ 5,566,000
Expected contribution to pensions plans in the remainder of current fiscal year	5,000,000
VEBA
Defined Benefit Plan Disclosure
Contribution made to Pension Plan	$ 0	$ 0