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Retirement Benefits - Summary of defined benefit pension plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Change in plan assets      
Fair value of plan assets at beginning of year $ 3,896,001    
Fair value of plan assets at end of year 3,915,889 $ 3,896,001  
Amounts recognized on the Consolidated Balance Sheet      
Pensions and other postretirement benefits (1,177,605) (1,406,082)  
Pension Plans, Defined Benefit      
Change in benefit obligation      
Benefit obligation at beginning of year 5,217,857 5,315,655  
Service cost 82,993 94,356 $ 94,650
Interest cost 144,339 126,131 181,469
Acquisition 0 201,283  
Plan amendments 2,932 3,265  
Divestiture (9,535) (851)  
Actuarial gain (182,588) (268,370)  
Benefits paid (216,169) (250,289)  
Foreign currency translation and other (5,832) (3,323)  
Benefit obligation at end of year 5,033,997 5,217,857 5,315,655
Change in plan assets      
Fair value of plan assets at beginning of year 3,896,001 3,307,047  
Actual gain on plan assets 174,951 341,344  
Acquisition 0 168,264  
Divestiture (12,231) 0  
Employer contributions 81,518 330,932  
Benefits paid (216,169) (250,289)  
Foreign currency translation and other (8,181) (1,297)  
Fair value of plan assets at end of year 3,915,889 3,896,001 $ 3,307,047
Funded status (1,118,108) (1,321,856)  
Amounts recognized on the Consolidated Balance Sheet      
Other accrued liabilities (11,333) (12,793)  
Pensions and other postretirement benefits (1,106,775) (1,309,063)  
Net amount recognized (1,118,108) (1,321,856)  
Amounts recognized in Accumulated Other Comprehensive (Loss)      
Net actuarial loss 1,216,612 1,461,017  
Prior service cost 18,900 22,761  
Transition obligation 61 77  
Net amount recognized $ 1,235,573 $ 1,483,855