Benefit Plans (Tables)

9 Months Ended

Mar. 31, 2018

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 March 31,	2018			2017			2018			2017
Components of net periodic cost:
Service cost	$	31		$	31		$	5		$	7
Interest cost	182			173			13			16
Expected return on plan assets	(118		)	(115		)	—			—
Recognized net actuarial loss (gain)	106			218			(39		)	(45		)
Amortization of prior service cost	7			22			(92		)	(68		)
Net periodic cost	$	208		$	329		$	(113	)	$	(90	)

	Pension Benefits						Retiree Health Care Benefits
Nine Months Ended March 31,	2018			2017			2018			2017
Components of net periodic cost:
Service cost	$	93		$	94		$	14		$	21
Interest cost	549			519			39			48
Expected return on plan assets	(355		)	(345		)	—			—
Recognized net actuarial loss (gain)	318			654			(116		)	(136		)
Amortization of prior service cost	21			65			(276		)	(203		)
Net periodic cost	$	626		$	987		$	(339	)	$	(270	)