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PRODUCT WARRANTY - Additional Information (Detail)	12 Months Ended
	Jul. 31, 2021
Product Warranty One
Product Warranty Liability [Line Items]
Warranty period for retail customers, years	1 year
Product Warranty Two
Product Warranty Liability [Line Items]
Warranty period for retail customers, years	2 years

X

- Definition

Warranty period for retail customer.

+ References

No definition available.

+ Details

Name:	tho_WarrantyPeriodForRetailCustomer
Namespace Prefix:	tho_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ProductWarrantyLiabilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=tho_TermOfProductWarrantyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=tho_TermOfProductWarrantyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: