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Contingent Liabilities and Commitments and Legal Matters - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Apr. 30, 2015 | Jul. 31, 2014
Loss Contingencies [Line Items] |  |
Standby Repurchase Obligations Amount | $ 1,576,439 tho_StandbyRepurchaseObligationsOnDealerInventoryFinancing | $ 1,226,650 tho_StandbyRepurchaseObligationsOnDealerInventoryFinancing
Term of Commitments | Up to eighteen months |
Repurchase and guarantee reserve balances | $ 4,942 tho_RepurchaseAndGuaranteeReserveBalances | $ 3,948 tho_RepurchaseAndGuaranteeReserveBalances

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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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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration