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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Amortization of net actuarial gains and losses, tax $ (32) $ (40) $ 0 $ 45