Employee Benefits - Summary Information for Plans (Comprised Solely of One Domestic Plan) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Change in Benefit Obligation:
Benefit obligation at beginning of year	$ 1,583	$ 1,476
Interest cost	54	65
Actuarial (gain) loss	(53)	169
Benefits paid	(78)	(127)
Benefit obligation end of year	1,506	1,583
Change in Fair Value of Plan Assets:
Beginning fair value	826	848
Actual return on plan assets	3	(23)
Employer contribution	140	128
Benefits paid	(78)	(127)
Plan assets at end of year	891	826
Funded status of the plans	(615)	(757)
Unrecognized actuarial loss	525	676
Prepaid (accrued) benefit cost	(90)	(81)
Amounts Recognized in Consolidated Balance Sheets
Prepaid (accrued) benefit cost	(90)	(81)
Accumulated other comprehensive loss	525	676
Net amount recognized	$ (615)	$ (757)