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Contingent Liabilities And Commitments ( Losses Due To Repurchases Under Repurchase Agreements) (Details) (USD $) In Thousands | 12 Months Ended
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Jul. 31, 2011 | Jul. 31, 2010 | Jul. 31, 2009
Contingent Liabilities And Commitments |  |  |
Cost of units repurchased | $ 5,876 | $ 10,001 | $ 32,913
Realization of units resold | 5,023 | 8,665 | 27,652
Losses due to repurchase | $ 853 | $ 1,336 | $ 5,261

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- Definition Cost of units repurchased + Details
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Namespace Prefix: | tho
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Losses Due To Repurchase. + Details
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Namespace Prefix: | tho
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Realization of units resold + 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_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration