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Employee Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010
Schedule of Employee Benefit Plans [Line Items] |  |  |
Employer match and administrative fees for 401(k) plan | $ 316 | $ 293 | $ 294
Investments under the plan | $ 8,970 | $ 8,715 |

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- Definition Defined benefit plan employer match and administrative fees. + References No definition available. + Details
Name: | tho_DefinedBenefitPlanEmployerMatchAndAdministrativeFees
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of nonqualified deferred compensation plan. + References No definition available. + Details
Name: | tho_FairValueOfNonqualifiedDeferredCompensationPlan
Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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