Significant Accounting Policies - Recent accounting pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax deferred charge	$ (36,057)	$ (605,155)
Income tax benefit	35,589
Cash flows from operating activities, increase	1,302,471	1,210,778	$ 1,363,233
Cash flows from financing activities, decrease	(1,782,628)	843,358	1,106,036
Investments and other assets	842,475	827,492
Notes payable and long-term debt payable within one year	1,008,465	361,787
Long-term debt	4,861,895	2,652,457
Accounting Standards Update 2016-09, Excess Tax Benefit Component
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash flows from operating activities, increase		40,935	61,292
Cash flows from financing activities, decrease		40,935	$ 61,292
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments and other assets		850,088
Notes payable and long-term debt payable within one year		361,840
Long-term debt		$ 2,675,000
New Accounting Pronouncement, Early Adoption, Effect | Pro Forma | Accounting Standard Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax deferred charge	$ 57,000