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Contingent Liabilities And Commitments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	9 Months Ended
	Jun. 01, 2012	Apr. 30, 2012	Jul. 31, 2011
Loss Contingencies [Line Items]
Repurchase and guarantee reserve balances		$ 3,662	$ 3,479
Chassis delivered to customers in days		90 days
Chassis consigned inventory		11,935
Additional chassis provided by customers		8,082
Suits currently pending		500
Payments for the benefit of settlement class	4,700	6,250
Multidistrict Litigation Court [Member]
Loss Contingencies [Line Items]
Suits currently pending		4,100
Heartland Recreational Vehicles, LLC, [Member]
Loss Contingencies [Line Items]
Payments for the benefit of settlement class		$ 553

X

- Definition

Chassis consigned inventory.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Chassis delivered to customers in days.

+ References

No definition available.

+ Details

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Namespace Prefix:	tho_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Repurchase and guarantee reserve balances.

+ References

No definition available.

+ Details

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

X

- Definition

Total additional chassis provided by customers.

+ References

No definition available.

+ Details

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Namespace Prefix:	tho_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Details

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Period Type:	duration

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 27

-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.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

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