CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury Stock	Stockholders' equity attributable to THOR	Non-controlling interests
Beginning balance (in shares) at Jul. 31, 2020		65,396,531				10,197,775
Beginning balance at Jul. 31, 2020	$ 2,345,569	$ 6,540	$ 436,828	$ 2,201,330	$ 26,993	$ (351,909)	$ 2,319,782	$ 25,787
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	429,548			429,592			429,592	(44)
Restricted stock unit activity (in shares)		255,039				87,554
Restricted stock unit activity	(12,217)	$ 25	(3,925)			$ (8,317)	(12,217)
Dividends per common share	(68,100)			(68,100)			(68,100)
Stock-based compensation expense	21,424		21,424				21,424
Other comprehensive income (loss)	42,303				42,218		42,218	85
Dividend paid to non-controlling interest	(605)							(605)
Ending balance (in shares) at Apr. 30, 2021		65,651,570				10,285,329
Ending balance at Apr. 30, 2021	2,757,922	$ 6,565	454,327	2,562,822	69,211	$ (360,226)	2,732,699	25,223
Beginning balance (in shares) at Jan. 31, 2021		65,651,570				10,285,329
Beginning balance at Jan. 31, 2021	2,596,711	$ 6,565	448,010	2,402,211	73,676	$ (360,226)	2,570,236	26,475
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	182,719			183,311			183,311	(592)
Restricted stock unit activity	(2,049)		(2,049)				(2,049)
Dividends per common share	(22,700)			(22,700)			(22,700)
Stock-based compensation expense	8,366		8,366				8,366
Other comprehensive income (loss)	(4,520)				(4,465)		(4,465)	(55)
Dividend paid to non-controlling interest	(605)							(605)
Ending balance (in shares) at Apr. 30, 2021		65,651,570				10,285,329
Ending balance at Apr. 30, 2021	2,757,922	$ 6,565	454,327	2,562,822	69,211	$ (360,226)	2,732,699	25,223
Beginning balance (in shares) at Jul. 31, 2021		65,651,570				10,285,329
Beginning balance at Jul. 31, 2021	2,948,106	$ 6,565	460,482	2,770,401	44,621	$ (360,226)	2,921,843	26,263
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 856,456			856,861			856,861	(405)
Purchase of treasury shares (in shares)	1,090,067					1,090,067
Purchases of treasury shares	$ (98,321)					$ (98,321)	(98,321)
Restricted stock unit activity (in shares)		407,833				152,869
Restricted stock unit activity	(12,018)	$ 41	5,952			$ (18,011)	(12,018)
Dividends per common share	(71,496)			(71,496)			(71,496)
Stock-based compensation expense	22,736		22,736				22,736
Other comprehensive income (loss)	(188,319)				(187,230)		(187,230)	(1,089)
Dividend paid to non-controlling interest	(555)							(555)
Acquisitions	(15,406)		1,516				1,516	(16,922)
Ending balance (in shares) at Apr. 30, 2022		66,059,403				11,528,265
Ending balance at Apr. 30, 2022	3,441,183	$ 6,606	490,686	3,555,766	(142,609)	$ (476,558)	3,433,891	7,292
Beginning balance (in shares) at Jan. 31, 2022		66,059,403				11,029,159
Beginning balance at Jan. 31, 2022	3,253,584	$ 6,606	479,946	3,231,378	(55,703)	$ (436,568)	3,225,659	27,925
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 346,018			348,051			348,051	(2,033)
Purchase of treasury shares (in shares)	499,106					499,106
Purchases of treasury shares	$ (39,990)					$ (39,990)	(39,990)
Restricted stock unit activity (in shares)		0
Restricted stock unit activity	(526)		(526)				(526)
Dividends per common share	(23,663)			(23,663)			(23,663)
Stock-based compensation expense	9,750		9,750				9,750
Other comprehensive income (loss)	(87,290)				(86,906)		(86,906)	(384)
Dividend paid to non-controlling interest	(555)							(555)
Acquisitions	(16,145)		1,516				1,516	(17,661)
Ending balance (in shares) at Apr. 30, 2022		66,059,403				11,528,265
Ending balance at Apr. 30, 2022	$ 3,441,183	$ 6,606	$ 490,686	$ 3,555,766	$ (142,609)	$ (476,558)	$ 3,433,891	$ 7,292