Retirement Benefits (Notes)

9 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Retirement Benefits

Retirement benefits

Net pension benefit cost recognized included the following components:

	Three Months Ended						Nine Months Ended
	March 31,						March 31,
	2016			2015			2016			2015
Service cost	$	23,680		$	24,506		$	71,199		$	74,163
Interest cost	45,138			44,447			136,872			135,245
Special termination cost	—			—			7,088			—
Expected return on plan assets	(55,418		)	(54,658		)	(166,633		)	(164,847		)
Amortization of prior service cost	1,868			2,306			5,606			6,903
Amortization of net actuarial loss	42,573			38,171			127,841			114,896
Amortization of initial net obligation	4			4			12			13
Net pension benefit cost	$	57,845		$	54,776		$	181,985		$	166,373

During the three months ended March 31, 2016 and 2015, the Company recognized $1,001 and $1,019, respectively, in expense related to other postretirement benefits. During the nine months ended March 31, 2016 and 2015, the Company recognized $7,696 and $3,255, respectively, in expense related to other postretirement benefits.

During the nine months ended March 31, 2016, the Company provided enhanced retirement benefits in connection with a plant closure, which resulted in an increase in net pension benefit cost of $7,088 and an increase in expense related to other postretirement benefits of $4,521.