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Contingent Liabilities and Commitments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended
--- | --- | --- | ---
Oct. 31, 2013 | Jul. 31, 2013 | Oct. 31, 2013 Standby Repurchase Obligations On Dealer Inventory Financing
Loss Contingencies [Line Items] |  |  |
Standby repurchase obligations amount |  |  | $ 1,066,044
Term of commitments |  |  | Up to eighteen months
Repurchase and guarantee reserve balances | 3,855 | 3,778 |
Chassis delivered to customers in days | 90 days |  |
Chassis consigned inventory | 0 |  |
Additional chassis provided by customers | $ 206 |  |

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- Definition Chassis consigned inventory. + References No definition available. + Details
Name: | tho_ChassisConsignedInventory
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Chassis delivered to customers in days. + References No definition available. + Details
Name: | tho_ChassisDeliveredToCustomersInDays
Namespace Prefix: | tho_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | instant

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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
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Namespace Prefix: | tho_
Data Type: | us-types:durationStringItemType
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- Definition Total additional chassis provided by customers. + References No definition available. + Details
Name: | tho_TotalAdditionalChassisProvidedByCustomers
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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