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Pension and Other Postretirement Benefits - Components of Net Periodic Other Postretirement Benefit Cost (Details) - Other postretirement benefit plans [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Net periodic other postretirement benefit costs        
Interest cost $ 153 $ 157 $ 307 $ 314
Amortization of prior service credit (22) (6) (45) (11)
Recognition of actuarial loss 62 70 124 140
Net periodic other postretirement benefit cost $ 193 $ 221 $ 386 $ 443