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Losses Due to Repurchases under Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Oct. 31, 2013 | Oct. 31, 2012
Loss Contingencies [Line Items] |  |
Cost of units repurchased | $ 123 | $ 602
Realization of units resold | 101 | 505
Losses due to repurchase | $ 22 | $ 97

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- Definition Cost of units repurchased + References No definition available. + Details
Name: | tho_CostOfUnitsRepurchased
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Losses Due To Repurchase. + References No definition available. + Details
Name: | tho_LossesDueToRepurchase
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Realization of units resold + References No definition available. + Details
Name: | tho_RealizationOfUnitsResold
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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