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
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	13,953			13,953			13,953
Restricted stock unit activity (in shares)		167,591				55,975
Restricted stock unit activity	(1,833)	$ 16	2,569			$ (4,418)	(1,833)
Cash dividends	(20,595)			(20,595)			(20,595)
Stock compensation expense	4,530		4,530				4,530
Cumulative effect of adoption of ASU no. 2014-09, net of tax	(5,450)			(5,450)			(5,450)
Balance (in shares) at Oct. 31, 2018		62,933,415				10,126,434
Ending balance at Oct. 31, 2018	1,928,346	$ 6,293	259,303	2,010,896	0	$ (348,146)	1,928,346	0
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	51,845			51,065			51,065	780
Restricted stock unit activity (in shares)		206,624				71,341
Restricted stock unit activity	(2,306)	$ 21	1,436			$ (3,763)	(2,306)
Cash dividends	(22,080)			(22,080)			(22,080)
Stock compensation expense	5,013		5,013				5,013
Other comprehensive income (loss)	(2,729)				(2,587)		(2,587)	(142)
Balance (in shares) at Oct. 31, 2019		65,396,531				10,197,775
Ending balance at Oct. 31, 2019	$ 2,124,971	$ 6,540	$ 422,831	$ 2,095,659	$ (59,591)	$ (351,909)	$ 2,113,530	$ 11,441