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Summary of Allowance for Doubtful Accounts Activity (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2012
Allowance for Sales Return and Doubtful Accounts [Line Items] |  |  |
Beginning balance | $ 157 | $ 527 | $ 549
Net charged to expense | 63 | (47) | 32
Write-offs net of recoveries/payments | (72) | (130) | (54)
Acquisitions | 200 |  |
Discontinued operations reclassification |  | (193) |
Ending balance | $ 348 | $ 157 | $ 527

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- Definition Allowance For Doubtful Accounts Provision Charged To (Income) Expense + References No definition available. + Details
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Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Allowance For Doubtful Accounts Receivable, Discontinued Operations Reclassification + References No definition available. + Details
Name: | tho_AllowanceForDoubtfulAccountsReceivableDiscontinuedOperationsReclassification
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Allowance For Doubtful Accounts Write Offs Against Payments And Recoveries + References No definition available. + Details
Name: | tho_AllowanceForDoubtfulAccountsWriteOffsAgainstPaymentsAndRecoveries
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: 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=28368275&loc=d3e5074-111524 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
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant