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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]      
Eligible Age for Availing Postretirement Healthcare Benefits 55    
Years of Service 10    
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ (14,322,000) $ (17,266,000) $ (18,192,000)
Defined Contribution Plan [Abstract]      
Defined Contribution Plan, Cost 16,300,000 19,600,000 15,800,000
Pension plans contribution [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 0 (2,935,000)  
Accumulated Benefit Obligation for all Defined Benefit Pension Plans 962,900,000 902,100,000  
Net Periodic Pension Cost (13,466,000) (16,518,000) (16,290,000)
Special termination benefit charge 0 0 98,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 (626,000) (379,000)
Projected Benefit Payments for 2020 51,500,000    
Projected Benefit Payments for 2021 52,000,000    
Projected Benefit Payments for 2022 52,600,000    
Projected Benefit Payments for 2023 53,700,000    
Projected Benefit Payments for 2024 55,500,000    
Projected Benefit Payments for 2025 through 2029 278,600,000    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2020 related to Net Actuarial Losses 10,421,635    
Estimated Future Employer Contributions in 2020 9,722,463    
Service Cost 1,627,000 1,635,000 2,908,000
Other postretirement benefit plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Pension Cost 771,000 887,000 1,006,000
Projected Benefit Payments for 2020 1,418,000    
Projected Benefit Payments for 2021 1,300,000    
Projected Benefit Payments for 2022 1,200,000    
Projected Benefit Payments for 2023 1,100,000    
Projected Benefit Payments for 2024 1,000,000    
Projected Benefit Payments for 2025 through 2029 4,100,000    
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2020 related to Net Actuarial Losses 256,609    
Accumulated Other Comprehensive Income Expected to be Recognized in Net Periodic Pension Cost during 2020 related to Prior Service Credit (275,681)    
Estimated Future Employer Contributions in 2020 $ 1,418,105    
Cost of Goods, Total [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component   12,169,000 12,791,000
Operating Expense [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component   $ 5,097,000 $ 5,401,000