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Loan Transactions and Related Notes Receivable - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2015 | Dec. 31, 2009 | Jan. 31, 2009
First Credit Agreement |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan amount |  |  | $ 10,000
Second Credit Agreement |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan amount |  |  | $ 10,000
Third Credit Agreement |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan amount |  | $ 10,000 |
Notes receivable, maturity | 2015-08 |  |

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |