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Summary of Allowance for Doubtful Accounts Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Allowance for Sales Return and Doubtful Accounts [Line Items] |  |  |
Beginning balance | $ 1,283 | $ 348 | $ 157
Net recorded expense (income) | (9) | 359 | 63
Write-offs, net of recoveries/payments | (679) | (67) | (72)
Acquisitions | 30 | 643 | 200
Ending balance | $ 625 | $ 1,283 | $ 348

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- Definition Allowance For Doubtful Accounts Provision Charged To (Income) Expense + References No definition available. + Details
Name: | tho_AllowanceForDoubtfulAccountsProvisionChargedToIncomeExpense
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 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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- Definition Allowance for Sales Return and Doubtful Accounts [Line Items] + References No definition available. + 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 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 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=66008989&loc=d3e5074-111524 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant