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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
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 $ 17,189 $ 23,118 $ 20,386
Pension plans contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Settlements, Benefit Obligation (7,991) 0  
Accumulated Benefit Obligation for all Defined Benefit Pension Plans 1,003,500 943,500  
Net Periodic Pension Cost (8,647) (10,751) (9,047)
Special termination benefit charge 334 459 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements (227) (261) 0
Curtailment loss 0 (358) 0
Projected Benefit Payments for 2016 52,200    
Projected Benefit Payments for 2017 48,200    
Projected Benefit Payments for 2018 50,100    
Projected Benefit Payments for 2019 51,800    
Projected Benefit Payments for 2020 53,500    
Projected Benefit Payments for 2021 through 2025 283,300    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2015 related to Net Actuarial Losses 8,500    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2015 related to Transition Obligations 94    
Accumulated Other Comprehensive Income Expected to be Recognized in Net Periodic Pension Cost during 2015 related to Prior Service Credit (500)    
Estimated Future Employer Contributions in 2015 12,100    
Other postretirement benefit plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Pension Cost 1,142 1,191 1,267
Curtailment loss 0 $ 221 $ 0
Projected Benefit Payments for 2016 2,000    
Projected Benefit Payments for 2017 1,900    
Projected Benefit Payments for 2018 1,800    
Projected Benefit Payments for 2019 1,700    
Projected Benefit Payments for 2020 1,600    
Projected Benefit Payments for 2021 through 2025 6,800    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2015 related to Net Actuarial Losses 400    
Estimated Future Employer Contributions in 2015 $ 2,000