Benefit Plans (Tables)

6 Months Ended

Mar. 31, 2013

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Net Pension and Postretirement Cost

Net pension and postretirement cost included the following components for the three months ended March 31:

	Pension Plans						Other Postretirement Benefits
	2013			2012			2013			2012
Service cost	$	21,004		$	17,723		$	1,443		$	1,475
Interest cost		21,747			21,540			2,519			3,220
Expected return on plan assets		(29,169	)		(24,452	)		—			—
Amortization of prior service credit		(3,269	)		(2,594	)		(285	)		(172	)
Amortization of loss		18,785			13,234			977			1,163
Net pension and postretirement cost	$	29,098		$	25,451		$	4,654		$	5,686

Net pension and postretirement cost included the following components for the six months ended March 31:

	Pension Plans						Other Postretirement Benefits
	2013			2012			2013			2012
Service cost	$	41,947		$	40,752		$	2,886		$	2,945
Interest cost		43,431			49,529			5,037			6,435
Expected return on plan assets		(58,253	)		(56,224	)		—			—
Amortization of prior service credit		(6,529	)		(5,964	)		(570	)		(345	)
Amortization of loss		37,516			30,430			1,954			2,325
Net pension and postretirement cost	$	58,112		$	58,523		$	9,307		$	11,360