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Schedule of Net Periodic Pension Costs (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]        
Service cost $ 953 $ 946 $ 1,891 $ 1,898
Interest cost 139 107 276 214
Expected return on plan assets (250) (213) (496) (428)
Net amortization (109) 45 (42) 150
Net periodic pension costs $ 733 $ 885 $ 1,629 $ 1,834