Earnings Per Share - Reconciliation of the numerator and denominator of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income attributable to common shareholders									$ 1,206,341	$ 1,512,364	$ 1,060,801
Denominator:
Basic - weighted-average common shares (in shares)									128,418,495	129,997,640	133,004,613
Increase in weighted-average common shares from dilutive effect of equity-based awards (in shares)									1,386,539	1,783,977	2,422,221
Diluted - weighted-average common shares, assuming exercise of stock-based awards (in shares)									129,805,034	131,781,617	135,426,834
Basic earnings per share (in USD per share)									$ 9.39	$ 11.63	$ 7.98
Diluted earnings per share (in USD per share)	$ 2.27	$ 2.83	$ 1.57	$ 2.60	$ 3.17	$ 3.14	$ 2.36	$ 2.79	$ 9.29	$ 11.48	$ 7.83