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Contingent Liabilities And Commitments (Principal Commercial Commitments Under Repurchase Agreements And Guarantees) (Details) (USD $) In Thousands	Jul. 31, 2011	Jul. 31, 2010
Guarantee On Dealer Financing [Member]
Total Amount Committed	$ 1,684	$ 1,524
Term of Commitments	Various
Standby Repurchase Obligation On Dealer Financing [Member]
Total Amount Committed	$ 791,933	$ 563,636
Term of Commitments	Up to eighteen months

X

- Definition

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

+ Details

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Namespace Prefix:	tho
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Total amount committed under repurchase agreements for the repurchase of products sold to dealers.

+ Details

Name:	tho_TotalAmountCommittedUnderRepurchaseAgreementsForRepurchaseOfProductsSoldToDealers
Namespace Prefix:	tho
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant