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v2.4.1.9

Product Warranties - Additional Information (Detail) | 9 Months Ended
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Apr. 30, 2015
Product Warranty Liability [Line Items] |
Warranty period for retail customers, years | 1 year

X
- Definition Warranty period for retail customer. + References No definition available. + Details
Name: | tho_WarrantyPeriodForRetailCustomer
Namespace Prefix: | tho_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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