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Employee Benefit Plans - Change in Accumulated Other Comprehensive (Income) Loss (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive (Income) Loss Related to Pension Plan      
Balance at beginning of period $ 30,977 $ 19,884  
Amortization of net actuarial loss and prior service costs (9,213) (1,784)  
Current period net actuarial (gain) loss (3,705) 12,877  
Net change (12,918) 11,093 $ 3,221
Balance at end of period $ 18,059 $ 30,977 $ 19,884