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Contingent Liabilities, Commitments and Legal Matters (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Oct. 31, 2020 | Jul. 31, 2020
Commitments and Contingencies Disclosure [Abstract] |  |
Standby repurchase obligations amount | $ 1,614,954 | $ 1,876,922
Term of commitments | 18 months |
Repurchase and guarantee reserve balances | $ 6,308 | $ 7,747

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- Definition Repurchase and guarantee reserve balances. + References No definition available. + Details
Name: | tho_RepurchaseAndGuaranteeReserveBalances
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Standby repurchase obligations on dealer inventory financing. + References No definition available. + Details
Name: | tho_StandbyRepurchaseObligationsOnDealerInventoryFinancing
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Terms of commitments under repurchase agreements for the repurchase of products sold to dealers. + References No definition available. + Details
Name: | tho_TermsOfCommitmentsUnderRepurchaseAgreementsForRepurchaseOfProductsSoldToDealers
Namespace Prefix: | tho_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration