Inventories - Statements of Income and Comprehensive Income adjustments due to change in accounting method (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
Consolidated Statements of Income
Cost of sales	$ 2,712,785	$ 2,518,165	$ 2,386,449	$ 2,759,637	$ 2,686,131	$ 2,480,992	$ 10,449,680		$ 10,292,291	[1]	$ 10,688,970	[1]
Income before income taxes	599,340	577,892	413,174	461,213	251,380	431,905	2,246,957		1,506,854	[1]	1,949,475	[1]
Income tax expense	126,101	129,350	93,063	88,501	49,331	93,811	500,096		304,522	[1]	424,392	[1]
Net Income	473,239	448,542	320,111	372,712	202,049	338,094	1,746,861	[2]	1,202,332	[2],[3]	1,525,083	[2],[4]
Net income attributable to common shareholders	$ 473,153	$ 448,351	$ 319,803	$ 372,596	$ 201,925	$ 337,951	$ 1,746,100		$ 1,201,970	[4]	$ 1,524,516	[4]
Earnings per share attributable to common shareholders:
Basic (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 (in USD per share)	$ 3.60	$ 3.42	$ 2.45	$ 2.87	$ 1.55	$ 2.60	$ 13.35		$ 9.26	[1]	$ 11.57	[1]
Consolidated Statements of Comprehensive Income
Net income	$ 473,239	$ 448,542	$ 320,111	$ 372,712	$ 202,049	$ 338,094	$ 1,746,861	[2]	$ 1,202,332	[2],[3]	$ 1,525,083	[2],[4]
Net income attributable to common shareholders	473,153	448,351	319,803	372,596	201,925	337,951	1,746,100		1,201,970	[4]	1,524,516	[4]
Total comprehensive income attributable to common shareholders							2,738,248		702,143	[4]	1,230,288	[4]
Previously Reported
Consolidated Statements of Income
Cost of sales	2,714,773	2,519,545	2,384,328	2,766,693	2,682,765	2,479,741	10,464,495		10,286,518		10,703,484
Income before income taxes	597,352	576,512	415,295	454,157	254,746	433,156	2,232,142		1,512,627		1,933,425
Income tax expense	125,619	129,015	93,578	86,788	50,148	94,115	499,269		305,924		420,494
Net Income	471,733	447,497	321,717	367,369	204,598	339,041	1,732,873		1,206,703		1,512,931
Net income attributable to common shareholders	$ 471,647	$ 447,306	$ 321,409	$ 367,253	$ 204,474	$ 338,898	$ 1,732,112		$ 1,206,341		$ 1,512,364
Earnings per share attributable to common shareholders:
Basic (in USD per share)	$ 3.65	$ 3.47	$ 2.50	$ 2.86	$ 1.59	$ 2.64	$ 13.43		$ 9.39		$ 11.63
Diluted (in USD per share)	$ 3.59	$ 3.41	$ 2.47	$ 2.83	$ 1.57	$ 2.60	$ 13.24		$ 9.29		$ 11.48
Consolidated Statements of Comprehensive Income
Net income	$ 471,733	$ 447,497	$ 321,717	$ 367,369	$ 204,598	$ 339,041	$ 1,732,873		$ 1,206,703		$ 1,512,931
Net income attributable to common shareholders	471,647	447,306	321,409	367,253	204,474	338,898	1,732,112		1,206,341		1,512,364
Total comprehensive income attributable to common shareholders							2,724,260		706,514		1,218,136
Effect of Change
Consolidated Statements of Income
Cost of sales	(1,988)	(1,380)	2,121	(7,056)	3,366	1,251	(14,815)		5,773		(14,514)
Income before income taxes	1,988	1,380	(2,121)	7,056	(3,366)	(1,251)	14,815		(5,773)		16,050
Income tax expense	482	335	(515)	1,713	(817)	(304)	827		(1,402)		3,898
Net Income	1,506	1,045	(1,606)	5,343	(2,549)	(947)	13,988		(4,371)		12,152
Net income attributable to common shareholders	$ 1,506	$ 1,045	$ (1,606)	$ 5,343	$ (2,549)	$ (947)	$ 13,988		$ (4,371)		$ 12,152
Earnings per share attributable to common shareholders:
Basic (in USD per share)	$ 0.02	$ 0.01	$ (0.02)	$ 0.04	$ (0.02)	$ (0.01)	$ 0.11		$ (0.03)		$ 0.10
Diluted (in USD per share)	$ 0.01	$ 0.01	$ (0.02)	$ 0.04	$ (0.02)	$ 0	$ 0.11		$ (0.03)		$ 0.09
Consolidated Statements of Comprehensive Income
Net income	$ 1,506	$ 1,045	$ (1,606)	$ 5,343	$ (2,549)	$ (947)	$ 13,988		$ (4,371)		$ 12,152
Net income attributable to common shareholders	$ 1,506	$ 1,045	$ (1,606)	$ 5,343	$ (2,549)	$ (947)	13,988		(4,371)		12,152
Total comprehensive income attributable to common shareholders							$ 13,988		$ (4,371)		$ 12,152

[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.

[2] *The balances at June 30, 2018 and the year ended June 30, 2020 and 2019 amounts have been revised to reflect the change in inventory accounting method, as described in Notes 1 and 7 to the consolidated financial statements.

[3] *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.

[4] *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.