Retirement benefits

3 Months Ended

Sep. 30, 2011

Retirement benefits

10. Retirement benefits

Net pension benefit cost recognized included the following components:

	Three Months Ended September 30,
	2011			2010
Service cost	$	21,624		$	21,870
Interest cost		45,916			43,271
Expected return on plan assets		(50,169	)		(48,733	)
Amortization of prior service cost		3,484			3,129
Amortization of net actuarial loss		25,414			25,798
Amortization of initial net (asset)		(15	)		(14	)
Net pension benefit cost	$	46,254		$	45,321

Net postretirement benefit cost recognized included the following components:

	Three Months Ended September 30,
	2011		2010
Service cost	$	181	$	139
Interest cost		881		982
Net amortization and deferral and other		129		(114	)
Net postretirement benefit cost	$	1,191	$	1,007