Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Stockholders' Equity Attributable to Thor	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Non-controlling Interests
Beginning balance (in shares) at Jul. 31, 2020			65,396,531
Beginning balance (in shares) at Jul. 31, 2020							10,197,775
Balance at beginning of period, net of tax at Jul. 31, 2020	$ 2,345,569	$ 2,319,782	$ 6,540	$ 436,828	$ 2,201,330	$ 26,993	$ (351,909)	$ 25,787
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	660,870	659,872			659,872			998
Restricted stock unit activity (in shares)			255,039				87,554
Restricted stock unit activity	(15,152)	(15,152)	$ 25	(6,860)			$ (8,317)
Cash dividends	(90,801)	(90,801)			(90,801)
Stock compensation expense	30,514	30,514		30,514
Other comprehensive income	17,711	17,628				17,628		83
Dividend paid to non-controlling interest	(605)							(605)
Ending balance (in shares) at Jul. 31, 2021			65,651,570
Ending balance (in shares) at Jul. 31, 2021							10,285,329
Balance at end of period at Jul. 31, 2021	2,948,106	2,921,843	$ 6,565	460,482	2,770,401	44,621	$ (360,226)	26,263
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,138,243	1,137,804			1,137,804			439
Purchase of treasury shares (in shares)							1,944,243
Purchase of treasury shares	(165,107)	(165,107)					$ (165,107)
Restricted stock unit activity (in shares)			407,833				152,869
Restricted stock unit activity	(13,443)	(13,443)	$ 41	4,527			$ (18,011)
Cash dividends	(94,944)	(94,944)			(94,944)
Stock compensation expense	31,421	31,421		31,421
Other comprehensive income	(227,661)	(226,228)				(226,228)		(1,433)
Dividend paid to non-controlling interest	(555)							(555)
Acquisitions	$ (15,406)	1,516		1,516				(16,922)
Ending balance (in shares) at Jul. 31, 2022			66,059,403
Ending balance (in shares) at Jul. 31, 2022	12,382,441						12,382,441
Balance at end of period at Jul. 31, 2022	$ 3,600,654	3,592,862	$ 6,606	497,946	3,813,261	(181,607)	$ (543,344)	7,792
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 374,240	374,271			374,271			(31)
Purchase of treasury shares (in shares)	549,532						549,532
Purchase of treasury shares	$ (42,007)	(42,007)					$ (42,007)
Restricted stock unit activity (in shares)			284,937				98,057
Restricted stock unit activity	(5,714)	(5,714)	$ 28	1,574			$ (7,316)
Cash dividends	(95,969)	(95,969)			(95,969)
Stock compensation expense	39,512	39,512		39,512
Other comprehensive income	$ 112,682	113,060				113,060		(378)
Ending balance (in shares) at Jul. 31, 2023			66,344,340
Ending balance (in shares) at Jul. 31, 2023	13,030,030						13,030,030
Balance at end of period at Jul. 31, 2023	$ 3,983,398	$ 3,976,015	$ 6,634	$ 539,032	$ 4,091,563	$ (68,547)	$ (592,667)	$ 7,383