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Contingent Liabilities And Commitments (Losses Due To Repurchases Under Repurchase Agreements) (Details) (USD $) In Thousands	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Contingent Liabilities And Commitments [Abstract]
Cost of units repurchased	$ 1,700	$ 2,220
Realization of units resold	1,527	1,927
Losses due to repurchase	$ 173	$ 293

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- Definition

Cost of units repurchased

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Balance Type:	debit
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- Definition

Losses Due To Repurchase.

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Period Type:	duration

X

- Definition

Realization of units resold

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

X

- Details

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