Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Stockholders' Equity Attributable to Thor	Stockholders' Equity Attributable to Thor Cumulative Effect, Period of Adoption, Adjustment	Non-controlling Interests
Balance (in shares) at Jul. 31, 2018			62,765,824					10,070,459
Balance at beginning of period, net of tax at Jul. 31, 2018	$ 1,937,741	$ (5,450)	$ 6,277	$ 252,204	$ 2,022,988	$ (5,450)	$ 0	$ (343,728)	$ 1,937,741	$ (5,450)	$ 0
Net income (loss)	132,465				133,275				133,275		(810)
Restricted stock unit activity (in shares)			167,591					55,975
Restricted stock unit activity	(3,116)		$ 16	1,286				$ (4,418)	(3,116)
Cash dividends	(84,139)				(84,139)				(84,139)
Stock compensation expense	18,950			18,950					18,950
Other comprehensive income (loss)	(57,598)						(57,004)		(57,004)		(594)
Acquisitions (in shares)			2,256,492
Acquisitions	156,375		$ 226	143,942					144,168		12,207
Balance (in shares) at Jul. 31, 2019			65,189,907					10,126,434
Balance at end 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 (loss)	221,384				222,974				222,974		(1,590)
Restricted stock unit activity (in shares)			206,624					71,341
Restricted stock unit activity	(3,185)		$ 21	557				$ (3,763)	(3,185)
Cash dividends	(88,318)				(88,318)				(88,318)
Stock compensation expense	19,889			19,889					19,889
Other comprehensive income (loss)	83,736						83,997		83,997		(261)
Acquisitions	16,835										16,835
Balance (in shares) at Jul. 31, 2020			65,396,531					10,197,775
Balance at end 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 (loss)	660,870				659,872				659,872		998
Restricted stock unit activity (in shares)			255,039					87,554
Restricted stock unit activity	(15,152)		$ 25	(6,860)				$ (8,317)	(15,152)
Cash dividends	(90,801)				(90,801)				(90,801)
Stock compensation expense	30,514			30,514					30,514
Other comprehensive income (loss)	17,711						17,628		17,628		83
Dividend paid to non-controlling interest	(605)										(605)
Balance (in shares) at Jul. 31, 2021			65,651,570					10,285,329
Balance at end of period at Jul. 31, 2021	$ 2,948,106		$ 6,565	$ 460,482	$ 2,770,401		$ 44,621	$ (360,226)	$ 2,921,843		$ 26,263