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, 2019		65,189,907				10,126,434
Balance at beginning of period at Jul. 31, 2019	$ 2,095,228	$ 6,519	$ 416,382	$ 2,066,674	$ (57,004)	$ (348,146)	$ 2,084,425	$ 10,803
Net income	78,871			79,738			79,738	(867)
Restricted stock unit activity (in shares)		206,624				71,341
Restricted stock unit activity	(2,826)	$ 21	916			$ (3,763)	(2,826)
Dividends per common share	(44,159)			(44,159)			(44,159)
Stock-based compensation expense	10,075		10,075				10,075
Other comprehensive income	(14,855)				(14,411)		(14,411)	(444)
Ending balance (in shares) at Jan. 31, 2020		65,396,531				10,197,775
Ending balance at Jan. 31, 2020	2,122,334	$ 6,540	427,373	2,102,253	(71,415)	$ (351,909)	2,112,842	9,492
Beginning balance (in shares) at Oct. 31, 2019		65,396,531				10,197,775
Balance at beginning of period at Oct. 31, 2019	2,124,971	$ 6,540	422,831	2,095,659	(59,591)	$ (351,909)	2,113,530	11,441
Net income	27,026			28,673			28,673	(1,647)
Restricted stock unit activity	(520)		(520)				(520)
Dividends per common share	(22,079)			(22,079)			(22,079)
Stock-based compensation expense	5,062		5,062				5,062
Other comprehensive income	(12,126)				(11,824)		(11,824)	(302)
Ending balance (in shares) at Jan. 31, 2020		65,396,531				10,197,775
Ending balance at Jan. 31, 2020	2,122,334	$ 6,540	427,373	2,102,253	(71,415)	$ (351,909)	2,112,842	9,492
Beginning balance (in shares) at Jul. 31, 2020		65,396,531				10,197,775
Balance at beginning of period at Jul. 31, 2020	2,345,569	$ 6,540	436,828	2,201,330	26,993	$ (351,909)	2,319,782	25,787
Net income	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	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
Balance at beginning of period at Oct. 31, 2020	2,420,521	$ 6,565	442,794	2,292,387	11,219	$ (360,226)	2,392,739	27,782
Net income	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	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