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Contingent Liabilities and Commitments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Loss Contingencies [Line Items]
Standby Repurchase Obligations Amount	$ 1,226,650
Term of Commitments	Up to eighteen months
Repurchase and guarantee reserve balances	$ 3,948	$ 3,778

X

- Definition

Repurchase and guarantee reserve balances.

+ References

No definition available.

+ Details

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Namespace Prefix:	tho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Standby repurchase obligations on dealer inventory financing.

+ References

No definition available.

+ Details

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Namespace Prefix:	tho_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Terms of commitments under repurchase agreements for the repurchase of products sold to dealers.

+ References

No definition available.

+ Details

Name:	tho_TermsOfCommitmentsUnderRepurchaseAgreementsForRepurchaseOfProductsSoldToDealers
Namespace Prefix:	tho_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration