Cover Page - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2021	Sep. 15, 2021	Jan. 31, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jul. 31, 2021
Document Transition Report	false
Entity File Number	001-09235
Entity Registrant Name	THOR INDUSTRIES, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	93-0768752
Entity Address, Address Line One	601 E. Beardsley Ave.
Entity Address, City or Town	Elkhart
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	46514
City Area Code	(574)
Local Phone Number	970-7460
Title of 12(b) Security	Common stock (Par value $.10 Per Share)
Trading Symbol	THO
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 5,607
Entity Common Stock, Shares Outstanding		55,366,241
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0000730263
Current Fiscal Year End Date	--07-31
Documents Incorporated by Reference	Portions of the Proxy Statement for the Annual Meeting of Stockholders to be held on December 17, 2021 are incorporated by reference in Part III of this Annual Report on Form 10-K