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Product Warranty - Additional Information (Detail) | 12 Months Ended
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Jul. 31, 2012
Product Warranty [Line Items] |
Warranty period for retail customers, years | 1 year
Period of longer warranty for structural components | Up to 5 Years

X
- Definition Period of longer warranty for structural components + References No definition available. + Details
Name: | tho_PeriodOfLongerWarrantyForStructuralComponents
Namespace Prefix: | tho_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | tho_ProductWarrantyLineItems
Namespace Prefix: | tho_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Product Warranty Term + References No definition available. + Details
Name: | tho_ProductWarrantyTerm
Namespace Prefix: | tho_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration