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Contingent Liabilities And Commitments (Narrative) (Details) (USD $)	Oct. 31, 2011
Loss Contingencies [Line Items]
Repurchase and guarantee reserve balances	$ 3,501
Chassis delivered to customers in days	90
Chassis consigned inventory	17,698
Additional chassis provided by customers	8,927
Suits currently pending	550
Amount agreed to pay plaintiffs	2,625
Civil cash penalty for violating the books and records and internal control provisions of the federal securities laws and regulations	$ 1,000
Multidistrict Litigation Court [Member]
Loss Contingencies [Line Items]
Suits currently pending	4,100

X

- Definition

Amount agreed to pay plaintiffs.

+ Details

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

X

- Definition

Chassis consigned inventory.

+ Details

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

X

- Definition

Chassis delivered to customers in days.

+ Details

Name:	tho_ChassisDeliveredToCustomersInDays
Namespace Prefix:	tho
Data Type:	xbrli:integerItemType
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

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

X

- Definition

Repurchase and guarantee reserve balances.

+ 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.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
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