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Contingent Liabilities And Commitments (Principal Commercial Commitments Under Repurchase Agreements And Guarantees) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2012
Guarantee On Dealer Inventory Financing [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Total Amount Committed	$ 938
Term of Commitments	Various
Standby Repurchase Obligations On Dealer Inventory Financing [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Total Amount Committed	$ 887,039
Term of Commitments	Up to eighteen months

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- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	tho_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

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

+ References

No definition available.

+ Details

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

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- Details

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