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Schedule of Net Periodic Pension Costs (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]        
Service cost $ 967 $ 874 $ 2,865 $ 2,642
Interest cost 109 39 323 117
Expected return on plan assets (218) (176) (646) (532)
Net amortization (150) (189)   208
Net periodic pension costs $ 708 $ 548 $ 2,542 $ 2,435