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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, (Increase) Decrease in Benefits Paid $ (29,900)    
Defined Benefit Plan, Settlements, Benefit Obligation 32,800    
Defined Benefit Plan, Increase (Decrease) in Actual Return on Plans' Assets $ (88,600)    
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 $ 23,118 $ 20,386 $ 16,701
Pension plans contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation for all Defined Benefit Pension Plans 943,500 956,700  
Net Periodic Pension Cost (10,751) (9,047) 4,862
Special termination benefit charge 459 0 0
Curtailment loss (358) 0 0
Projected Benefit Payments for 2016 55,400    
Projected Benefit Payments for 2017 49,300    
Projected Benefit Payments for 2018 50,800    
Projected Benefit Payments for 2019 53,000    
Projected Benefit Payments for 2020 55,000    
Projected Benefit Payments for 2021 through 2025 295,900    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2015 related to Net Actuarial Losses 7,300    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2015 related to Transition Obligations 100    
Accumulated Other Comprehensive Income Expected to be Recognized in Net Periodic Pension Cost during 2015 related to Prior Service Credit (400)    
Estimated Future Employer Contributions in 2015 16,800    
Other postretirement benefit plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Pension Cost 1,191 1,267 1,316
Curtailment loss 221 $ 0 $ 0
Projected Benefit Payments for 2016 2,200    
Projected Benefit Payments for 2017 2,100    
Projected Benefit Payments for 2018 2,000    
Projected Benefit Payments for 2019 1,800    
Projected Benefit Payments for 2020 1,700    
Projected Benefit Payments for 2021 through 2025 7,300    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2015 related to Net Actuarial Losses 300    
Estimated Future Employer Contributions in 2015 $ 2,200