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Subsequent Events (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended
	Aug. 12, 2011
Subsequent Events
Stock Repurchase Agreement, number of shares agreed to be repurchased	1,000,000
Stock Repurchase Agreement, price per share	$ 20
Stock Repurchase Agreement aggregate purchase price	$ 20,000
Percentage of issued and outstanding common stock prior to the repurchase	1.80%

X

- Definition

Percentage of issued and outstanding common stock prior to the repurchase

+ Details

Name:	tho_PercentageOfIssuedAndOutstandingCommonStockPriorToRepurchase
Namespace Prefix:	tho
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock Repurchase Program Price Of Per Shares Authorized To Be Repurchased

+ Details

Name:	tho_StockRepurchaseProgramPriceOfPerSharesAuthorizedToBeRepurchased
Namespace Prefix:	tho
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ Details

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventsAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration