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Product Warranty - Additional Information (Detail) | 12 Months Ended
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Jul. 31, 2018
Product Warranty One |
Product Warranty Liability [Line Items] |
Warranty period for retail customers, years | 1 year
Product Warranty Two |
Product Warranty Liability [Line Items] |
Warranty period for retail customers, years | 2 years

X
- Definition Warranty period for retail customer. + References No definition available. + Details
Name: | tho_WarrantyPeriodForRetailCustomer
Namespace Prefix: | tho_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=tho_TermOfProductWarrantyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=tho_TermOfProductWarrantyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |