Consolidated Statements of 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, 2018		62,765,824				10,070,459
Beginning balance at Jul. 31, 2018	$ 1,937,741	$ 6,277	$ 252,204	$ 2,022,988	$ 0	$ (343,728)	$ 1,937,741	$ 0
Net income	8,536			8,536			8,536	0
Restricted stock unit activity (in shares)		167,591				55,975
Restricted stock unit activity	(2,193)	$ 16	2,209	0	0	$ (4,418)	(2,193)	0
Cash dividends	(41,189)			(41,189)			(41,189)
Stock compensation expense	9,486	$ 0	9,486	0	0	$ 0	9,486	0
Cumulative effect of adoption of ASU no. 2014-09, net of tax	(5,450)			(5,450)			(5,450)
Ending balance (in shares) at Jan. 31, 2019		62,933,415				10,126,434
Ending balance at Jan. 31, 2019	1,906,931	$ 6,293	263,899	1,984,885	0	$ (348,146)	1,906,931	0
Beginning balance (in shares) at Oct. 31, 2018		62,933,415				10,126,434
Beginning balance at Oct. 31, 2018	1,928,346	$ 6,293	259,303	2,010,896	0	$ (348,146)	1,928,346	0
Net income	(5,417)			(5,417)			(5,417)
Restricted stock unit activity (in shares)		0				0
Restricted stock unit activity	(360)	$ 0	(360)			$ 0	(360)
Cash dividends	(20,594)			(20,594)			(20,594)
Stock compensation expense	4,956		4,956				4,956
Cumulative effect of adoption of ASU no. 2014-09, net of tax	0			0			0
Ending balance (in shares) at Jan. 31, 2019		62,933,415				10,126,434
Ending balance at Jan. 31, 2019	1,906,931	$ 6,293	263,899	1,984,885	0	$ (348,146)	1,906,931	0
Beginning balance (in shares) at Jul. 31, 2019		65,189,907				10,126,434
Beginning balance 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	0		$ (3,763)	(2,826)
Cash dividends	(44,159)			(44,159)			(44,159)
Stock compensation expense	10,075		10,075	0			10,075
Other comprehensive income (loss)	(14,855)				(14,411)	$ 0	(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
Beginning balance 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)
Cash dividends	(22,079)			(22,079)			(22,079)
Stock compensation expense	5,062		5,062				5,062
Other comprehensive income (loss)	(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