Employee Benefits - Summary Information for Plans (Comprised Solely of One Domestic Plan) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Change in Benefit Obligation:
Benefit obligation at beginning of year	$ 1,506	$ 1,583
Interest cost	55	54
Actuarial (gain)loss	(47)	(53)
Benefits paid	(94)	(78)
Benefit obligation end of year	1,420	1,506
Change in Fair Value of Plan Assets:
Beginning fair value	891	826
Actual return on plan assets	(2)	3
Employer contribution	100	140
Benefits paid	(94)	(78)
Plan assets at end of year	895	891
Funded status of the plans	(525)	(615)
Unrecognized actuarial loss	376	525
Prepaid (accrued) benefit cost	(149)	(90)
Amounts Recognized in Consolidated Balance Sheets
Prepaid (accrued) benefit cost	(149)	(90)
Accumulated other comprehensive loss	376	525
Net amount recognized	$ (525)	$ (615)