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Business Segments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2012 Segment | Jul. 31, 2011 | Jul. 31, 2010
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | 3 |  |
Net sales | $ 3,084,660 | $ 2,755,508 | $ 2,276,557
Export |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 463,130 | $ 444,364 | $ 364,105

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- Definition Number of reportable segments. + References No definition available. + Details
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Namespace Prefix: | tho_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueGoodsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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