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Contingent Liabilities, Commitments and Legal Matters - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |
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Apr. 30, 2019 | Jul. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |  |
Standby repurchase obligations amount | $ 3,337,543 | $ 2,748,465
Term of commitments | up to eighteen months |
Repurchase and guarantee reserve balances | $ 10,300 | $ 7,400

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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

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- 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

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- 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: | us-types:durationStringItemType
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