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Retirement Benefits - Summary of defined benefit pension plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Change in plan assets      
Fair value of plan assets at beginning of year $ 3,915,889    
Fair value of plan assets at end of year 4,244,969 $ 3,915,889  
Amounts recognized on the Consolidated Balance Sheet      
Pensions and other postretirement benefits (1,304,379) (1,177,605)  
Pension Plans, Defined Benefit      
Change in benefit obligation      
Benefit obligation at beginning of year 5,033,997 5,217,857  
Service cost 76,647 82,993 $ 94,356
Interest cost 160,542 144,339 126,131
Plan amendments 7,719 2,932  
Divestiture 0 (9,535)  
Actuarial loss (gain) 491,792 (182,588)  
Benefits paid (237,080) (216,169)  
Foreign currency translation and other (46,043) (5,832)  
Benefit obligation at end of year 5,487,574 5,033,997 5,217,857
Change in plan assets      
Fair value of plan assets at beginning of year 3,915,889 3,896,001  
Actual gain on plan assets 318,809 174,951  
Divestiture 0 (12,231)  
Employer contributions 284,965 81,518  
Benefits paid (237,080) (216,169)  
Foreign currency translation and other (37,614) (8,181)  
Fair value of plan assets at end of year 4,244,969 3,915,889 $ 3,896,001
Funded status (1,242,605) (1,118,108)  
Amounts recognized on the Consolidated Balance Sheet      
Other accrued liabilities (8,396) (11,333)  
Pensions and other postretirement benefits (1,234,209) (1,106,775)  
Net amount recognized (1,242,605) (1,118,108)  
Amounts recognized in Accumulated Other Comprehensive (Loss)      
Net actuarial loss 1,510,901 1,216,612  
Prior service cost 19,602 18,900  
Transition obligation 44 61  
Net amount recognized $ 1,530,547 $ 1,235,573