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Loan Transactions and Related Notes Receivable - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2013 First Credit Agreement | Jan. 31, 2009 First Credit Agreement | Jan. 31, 2009 Second Credit Agreement | Jul. 31, 2013 Third Credit Agreement | Dec. 31, 2009 Third Credit Agreement
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loan amount |  | $ 10,000 | $ 10,000 |  | $ 10,000
Original principal amount outstanding | $ 4,000 |  |  | $ 8,500 |
Notes receivable, maturity | Jan. 15, 2014 |  |  | Aug. 30, 2015 |

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- Definition Notes Receivable, Maturity Date + References No definition available. + Details
Name: | tho_NotesReceivableMaturityDate
Namespace Prefix: | tho_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Notes receivable non related parties + References No definition available. + Details
Name: | tho_NotesReceivableNonRelatedParties
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Remaining Principal Payment Amount on Note Receivable + References No definition available. + Details
Name: | tho_RemainingPrincipalPaymentAmountOnNoteReceivable
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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