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
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020		Jun. 30, 2019
Numerator:
Net income attributable to common shareholders, basic							$ 1,746,100	$ 1,201,970		$ 1,524,516
Net income attributable to common shareholders, diluted							$ 1,746,100	$ 1,201,970		$ 1,524,516
Denominator:
Basic - weighted-average common shares (in shares)							128,999,879	128,418,495		129,997,640
Increase in weighted-average common shares from dilutive effect of equity-based awards (in shares)							1,834,599	1,386,539		1,783,977
Diluted - weighted-average common shares, assuming exercise of stock-based awards (in shares)							130,834,478	129,805,034		131,781,617
Basic earnings per share (in USD per share)	$ 3.67	$ 3.48	$ 2.48	$ 2.90	$ 1.57	$ 2.63	$ 13.54	$ 9.36	[1]	$ 11.73	[1]
Diluted earnings per share (in USD per share)	$ 3.60	$ 3.42	$ 2.45	$ 2.87	$ 1.55	$ 2.60	$ 13.35	$ 9.26	[1]	$ 11.57	[1]

[1] *Years ended June 30, 2020 and 2019 amounts have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 7 to the Consolidated Financial Statements.