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Employee Benefit Plans (Details) (USD $) In Thousands	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Employee Benefit Plans
Employer match and administrative fees for 401(k) plan	$ 293	$ 294	$ 332
Investments under the plan	$ 8,715	$ 7,499

X

- Definition

Defined benefit plan employer match and administrative fees.

+ Details

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Balance Type:	debit
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X

- Definition

Fair value of nonqualified deferred compensation plan.

+ Details

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

X

- Details

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