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)	246,829			246,281			246,281	548
Restricted stock unit activity (in shares)		255,039				87,554
Restricted stock unit activity	(10,168)	$ 25	(1,876)			$ (8,317)	(10,168)
Dividends per common share	(45,400)			(45,400)			(45,400)
Stock-based compensation expense	13,058		13,058				13,058
Other comprehensive income (loss)	46,823				46,683		46,683	140
Ending balance (in shares) at Jan. 31, 2021		65,651,570				10,285,329
Ending balance at Jan. 31, 2021	2,596,711	$ 6,565	448,010	2,402,211	73,676	$ (360,226)	2,570,236	26,475
Beginning balance (in shares) at Oct. 31, 2020		65,651,570				10,285,329
Beginning balance at Oct. 31, 2020	2,420,521	$ 6,565	442,794	2,292,387	11,219	$ (360,226)	2,392,739	27,782
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	131,190			132,524			132,524	(1,334)
Restricted stock unit activity	(2,074)		(2,074)				(2,074)
Dividends per common share	(22,700)			(22,700)			(22,700)
Stock-based compensation expense	7,290		7,290				7,290
Other comprehensive income (loss)	62,484				62,457		62,457	27
Ending balance (in shares) at Jan. 31, 2021		65,651,570				10,285,329
Ending balance at Jan. 31, 2021	2,596,711	$ 6,565	448,010	2,402,211	73,676	$ (360,226)	2,570,236	26,475
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)	510,438			508,810			508,810	1,628
Purchase of treasury shares (in shares)						590,961
Purchases of treasury shares	(58,331)					$ (58,331)	(58,331)
Restricted stock unit activity (in shares)		407,833				152,869
Restricted stock unit activity	(11,492)	$ 41	6,478			$ (18,011)	(11,492)
Dividends per common share	(47,833)			(47,833)			(47,833)
Stock-based compensation expense	12,986		12,986				12,986
Other comprehensive income (loss)	(101,029)				(100,324)		(100,324)	(705)
Acquisitions	739							739
Ending balance (in shares) at Jan. 31, 2022		66,059,403				11,029,159
Ending balance at Jan. 31, 2022	3,253,584	$ 6,606	479,946	3,231,378	(55,703)	$ (436,568)	3,225,659	27,925
Beginning balance (in shares) at Oct. 31, 2021		66,058,290				10,438,198
Beginning balance at Oct. 31, 2021	3,132,242	$ 6,606	473,775	2,988,726	11,969	$ (378,237)	3,102,839	29,403
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 265,635			266,568			266,568	(933)
Purchase of treasury shares (in shares)	590,961					590,961
Purchases of treasury shares	$ (58,331)					$ (58,331)	(58,331)
Restricted stock unit activity (in shares)		1,113
Restricted stock unit activity	(788)		(788)				(788)
Dividends per common share	(23,916)			(23,916)			(23,916)
Stock-based compensation expense	6,959		6,959				6,959
Other comprehensive income (loss)	(68,217)				(67,672)		(67,672)	(545)
Ending balance (in shares) at Jan. 31, 2022		66,059,403				11,029,159
Ending balance at Jan. 31, 2022	$ 3,253,584	$ 6,606	$ 479,946	$ 3,231,378	$ (55,703)	$ (436,568)	$ 3,225,659	$ 27,925