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Benefit Plans - Components of Net Periodic Pension Income (Details) - Pension plans contribution [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Net periodic pension income        
Service cost $ 720 $ 1,154 $ 2,180 $ 3,473
Interest cost 7,756 9,375 23,335 28,299
Expected return on plan assets (14,659) (14,560) (44,088) (43,924)
Amortization of transition obligation 22 19 67 61
Amortization of prior service credit (113) (104) (339) (313)
Recognition of actuarial losses 2,066 1,805 6,266 5,452
Settlement gain (320)   (320)  
Special Termination Benefits Charge 0 0 0 214
Net periodic pension income $ (4,528) $ (2,311) $ (12,899) $ (6,738)