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Contingent Liabilities And Commitments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2011	Jul. 31, 2010
Contingent Liabilities And Commitments
Repurchase and guarantee reserve balances	$ 3,479	$ 3,312
Chassis delivered to customers in days	90
Chassis consigned inventory	23,138
Additional chassis provided by customers	12,520
Civil cash penalty for violating the books and records and internal control provisions of the federal securities laws and regulations	1,000
Suits currently pending	550
Amount agreed to pay plaintiffs	$ 2,625

X

- Definition

Amount agreed to pay plaintiffs.

+ Details

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X

- Definition

Chassis delivered to customers in days.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Civil cash penalty for violating the books and records and internal control provisions of the federal securities laws and regulations there under.

+ Details

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Balance Type:	credit
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X

- Definition

Repurchase and guarantee reserve balances.

+ Details

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

X

- Definition

Total additional chassis provided by customers.

+ Details

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Namespace Prefix:	tho
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Consigned unrecorded liability.

+ Details

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Namespace Prefix:	tho
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

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X

- Definition

The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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