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Nature of Operations and Accounting Policies - Additional Information (Detail) | 6 Months Ended
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Jan. 31, 2015 Segment
Summary Of Significant Accounting Policies [Line Items] |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments

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

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration