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Summary of Allowance for Doubtful Accounts Activity (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2011
Allowance for Sales Return and Doubtful Accounts [Line Items] |  |  |
Beginning balance | $ 527 | $ 549 | $ 422
Net charged to expense | (47) | 32 | 3
Write-offs net of recoveries/payments | (130) | (54) | (116)
Heartland acquisition |  |  | 240
Discontinued operations reclassification | (193) |  |
Ending balance | $ 157 | $ 527 | $ 549

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- Definition Allowance for doubtful accounts, provision charged to expense. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Allowance for doubtful accounts receivable acquisition. + References No definition available. + Details
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Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Allowance For Doubtful Accounts Receivable, Discontinued Operations Reclassification + References No definition available. + Details
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Namespace Prefix: | tho_
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- Definition Allowance for doubtful accounts, write offs against payments and recoveries. + References No definition available. + Details
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Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant