Retirement Benefits (Notes)

6 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Retirement Benefits

Retirement benefits

Net pension benefit cost recognized included the following components:

	Three Months Ended						Six Months Ended
	December 31,						December 31,
	2016			2015			2016			2015
Service cost	$	23,116		$	23,406		$	47,339		$	47,519
Interest cost	29,972			45,663			61,468			91,734
Special termination cost	—			7,088			—			7,088
Expected return on plan assets	(60,180		)	(55,566		)	(117,797		)	(111,215		)
Amortization of prior service cost	1,683			1,669			3,399			3,738
Amortization of net actuarial loss	54,325			42,299			105,752			85,268
Amortization of initial net obligation	5			4			10			8
Net pension benefit cost	$	48,921		$	64,563		$	100,171		$	124,140

During the three months ended December 31, 2016 and 2015, the Company recognized $1,116 and $5,608, respectively, in expense related to other postretirement benefits. During the six months ended December 31, 2016 and 2015, the Company recognized $2,232 and $6,695, respectively, in expense related to other postretirement benefits.

During the prior-year quarter, 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.

Beginning in fiscal 2017, the Company changed the method used to estimate the service and interest cost components of net periodic pension and other postretirement benefit costs. The new method uses the spot yield curve approach to estimate the service and interest costs by applying the specific spot rates along the yield curve used to determine the benefit obligations to relevant cash outflows. Previously, these costs were determined using a single-weighted average discount rate. The change does not affect the measurement of the Company's benefit obligations. The new method provides a more precise measure of service and interest costs by improving the correlation between projected benefit cash flows and the discrete spot yield curve rates and is accounted for as a change in estimate prospectively beginning the first quarter of fiscal 2017. As a result of the method change, net pension benefit cost for the current-year quarter and first six months of fiscal 2017 is lower than the prior-year quarter and first six months of fiscal 2016 by approximately $8 million and $17 million, respectively,