Equity - Changes in equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 5,865,493	$ 5,267,346
Impact of adoption of accounting standards			$ (251)
Net income	375,899	285,535
Other comprehensive income (loss)	(11,252)	99,614
Dividends paid	(100,869)	(88,104)
Stock incentive plan activity	28,086	16,297
Acquisition activity		(29)
Shares purchased at cost	(50,000)	(50,000)
Ending balance	$ 6,107,106	$ 5,530,659
Cash dividends per common share (in USD per share)	$ 0.76	$ 0.66
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 90,523	$ 90,523
Ending balance	90,523	90,523
Additional Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	496,592	543,879
Stock incentive plan activity	6,460	(14,923)
Ending balance	503,052	528,956
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	11,625,975	10,930,348
Impact of adoption of accounting standards			1,483
Net income	375,711	285,397
Dividends paid	(100,869)	(88,104)
Ending balance	11,902,300	11,127,641
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,763,086)	(1,924,204)
Impact of adoption of accounting standards			(1,734)
Other comprehensive income (loss)	(11,163)	99,701
Ending balance	(1,775,983)	(1,824,503)
Treasury Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(4,590,138)	(4,378,897)
Stock incentive plan activity	21,626	31,220
Shares purchased at cost	(50,000)	(50,000)
Ending balance	(4,618,512)	(4,397,677)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	5,627	5,697
Net income	188	138
Other comprehensive income (loss)	(89)	(87)
Acquisition activity		(29)
Ending balance	5,726	5,719
Foreign Currency Translation Adjustment and Other
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(943,477)	(925,342)
Impact of adoption of accounting standards			$ (1,734)
Ending balance	$ (980,247)	$ (852,376)