Benefit Plans (Tables)

6 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Net periodic costs

The following table provides summary disclosures of the net periodic postemployment costs recognized for the Company’s postemployment benefit plans:

	Pension Benefits						Retiree Health Care Benefits
Three Months Ended December 31,	2017			2016			2017			2016
Components of net periodic cost:
Service cost	$	31		$	32		$	4		$	7
Interest cost	184			173			13			16
Expected return on plan assets	(119		)	(115		)	—			—
Recognized net actuarial loss (gain)	106			218			(38		)	(46		)
Amortization of prior service cost	7			21			(92		)	(67		)
Net periodic cost	$	209		$	329		$	(113	)	$	(90	)

	Pension Benefits						Retiree Health Care Benefits
Six Months Ended December 31,	2017			2016			2017			2016
Components of net periodic cost:
Service cost	$	62		$	63		$	9		$	14
Interest cost	367			346			26			32
Expected return on plan assets	(237		)	(230		)	—			—
Recognized net actuarial loss (gain)	212			436			(77		)	(91		)
Amortization of prior service cost	14			43			(184		)	(135		)
Net periodic cost	$	418		$	658		$	(226	)	$	(180	)