Earnings Per Share - Computation of earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net income attributable to common shareholders									$ 983,412	$ 806,840	$ 1,012,140
Denominator:
Basic - weighted-average common shares									133,377,547	135,353,321	142,925,327
Increase in weighted-average common shares from dilutive effect of stock-based awards									2,182,217	1,558,369	2,186,823
Diluted - weighted-average common shares, assuming exercise of stock-based awards									135,559,764	136,911,690	145,112,150
Basic earnings per share (in USD per share)									$ 7.37	$ 5.96	$ 7.08
Diluted earnings per share (in USD per share)	$ 2.15	$ 1.75	$ 1.78	$ 1.55	$ 1.77	$ 1.37	$ 1.33	$ 1.41	$ 7.25	$ 5.89	$ 6.97