Earnings Per Share - Computation of earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income attributable to common shareholders									$ 1,512,364	$ 1,060,801	$ 983,412
Denominator:
Basic - weighted-average common shares (in shares)									129,997,640	133,004,613	133,377,547
Increase in weighted-average common shares from dilutive effect of equity-based awards (in shares)									1,783,977	2,422,221	2,182,217
Diluted - weighted-average common shares, assuming exercise of stock-based awards (in shares)									131,781,617	135,426,834	135,559,764
Basic earnings per share (in USD per share)									$ 11.63	$ 7.98	$ 7.37
Diluted earnings per share (in USD per share)	$ 3.17	$ 3.14	$ 2.36	$ 2.79	$ 2.62	$ 2.70	$ 0.41	$ 2.10	$ 11.48	$ 7.83	$ 7.25