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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]      
Eligible Age for Availing Postretirement Healthcare Benefits 55    
Years of Service 10    
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Defined Contribution Plan, Cost Recognized $ 15,766 $ 17,200 $ 23,100
Pension plans contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Settlements, Benefit Obligation (7,439) (7,991)  
Accumulated Benefit Obligation for all Defined Benefit Pension Plans 940,900 1,003,500  
Net Periodic Pension Cost (16,290) (8,647) (10,751)
Special termination benefit charge 98 334 459
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements (379) (227) (261)
Curtailment loss 0 0 (358)
Projected Benefit Payments for 2018 47,500    
Projected Benefit Payments for 2019 49,000    
Projected Benefit Payments for 2020 50,000    
Projected Benefit Payments for 2021 51,500    
Projected Benefit Payments for 2022 52,000    
Projected Benefit Payments for 2023 through 2026 277,800    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2018 related to Net Actuarial Losses 6,800    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2018 related to Transition Obligations 100    
Accumulated Other Comprehensive Income Expected to be Recognized in Net Periodic Pension Cost during 2018 related to Prior Service Credit (200)    
Estimated Future Employer Contributions in 2018 7,900    
Other postretirement benefit plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Pension Cost 1,006 1,142 1,191
Curtailment loss 0 $ 0 $ 221
Projected Benefit Payments for 2018 1,900    
Projected Benefit Payments for 2019 1,800    
Projected Benefit Payments for 2020 1,700    
Projected Benefit Payments for 2021 1,600    
Projected Benefit Payments for 2022 1,500    
Projected Benefit Payments for 2023 through 2026 6,200    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2018 related to Net Actuarial Losses 300    
Accumulated Other Comprehensive Income Expected to be Recognized in Net Periodic Pension Cost during 2018 related to Prior Service Credit 100    
Estimated Future Employer Contributions in 2018 $ 1,900