Retirement Benefits - Summary of defined benefit pension plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Change in plan assets
Fair value of plan assets at beginning of year	$ 3,307,047
Fair value of plan assets at end of year	3,896,001	$ 3,307,047
Amounts recognized on the Consolidated Balance Sheet
Pensions and other postretirement benefits	(1,406,082)	(2,076,143)
Pension Plans, Defined Benefit
Change in benefit obligation
Benefit obligation at beginning of year	5,315,655	4,867,703
Service cost	94,356	94,650	$ 97,960
Interest cost	126,131	181,469	176,556
Acquisition	201,283	0
Special termination cost	0	7,088	21,174
Plan amendments	3,265	2,992
Divestiture	(851)	0
Actuarial (gain) loss	(268,370)	487,523
Benefits paid	(250,289)	(230,551)
Foreign currency translation and other	(3,323)	(95,219)
Benefit obligation at end of year	5,217,857	5,315,655	4,867,703
Change in plan assets
Fair value of plan assets at beginning of year	3,307,047	3,238,307
Actual gain on plan assets	341,344	97,165
Acquisition	168,264	0
Employer contributions	330,932	279,140
Benefits paid	(250,289)	(230,551)
Foreign currency translation and other	(1,297)	(77,014)
Fair value of plan assets at end of year	3,896,001	3,307,047	$ 3,238,307
Funded status	(1,321,856)	(2,008,608)
Amounts recognized on the Consolidated Balance Sheet
Other accrued liabilities	(12,793)	(42,763)
Pensions and other postretirement benefits	(1,309,063)	(1,965,845)
Net amount recognized	(1,321,856)	(2,008,608)
Amounts recognized in Accumulated Other Comprehensive (Loss)
Net actuarial loss	1,461,017	2,047,103
Prior service cost	22,761	27,723
Transition obligation	77	103
Net amount recognized	$ 1,483,855	$ 2,074,929