Equity - Changes in equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 5,968,152	$ 5,865,493
Impact of adoption of accounting standards			$ (251)
Net income	339,041	375,899
Other comprehensive income (loss)	(71,696)	(11,252)
Dividends paid	(113,352)	(100,869)
Stock incentive plan activity	30,647	28,086
Shares purchased at cost	(50,000)	(50,000)
Ending balance	$ 6,102,792	$ 6,107,106
Cash dividends per common share (in USD per share)	$ 0.88	$ 0.76
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	462,086	496,592
Stock incentive plan activity	2,354	6,460
Ending balance	464,440	503,052
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	12,777,538	11,625,975
Impact of adoption of accounting standards			1,483
Net income	338,898	375,711
Dividends paid	(113,352)	(100,869)
Ending balance	13,003,084	11,902,300
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,059,048)	(1,763,086)
Impact of adoption of accounting standards			$ (1,734)
Other comprehensive income (loss)	(71,546)	(11,163)
Ending balance	(2,130,594)	(1,775,983)
Treasury Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(5,309,130)	(4,590,138)
Stock incentive plan activity	28,293	21,626
Shares purchased at cost	(50,000)	(50,000)
Ending balance	(5,330,837)	(4,618,512)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	6,183	5,627
Net income	143	188
Other comprehensive income (loss)	(150)	(89)
Ending balance	$ 6,176	$ 5,726