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Contingent Liabilities and Commitments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2014 | Jul. 31, 2013 | Jan. 31, 2014 Standby Repurchase Obligations On Dealer Inventory Financing
Loss Contingencies [Line Items] |  |  |
Standby repurchase obligations amount |  |  | $ 1,165,309
Term of commitments |  |  | Up to eighteen months
Repurchase and guarantee reserve balances | $ 4,177 | $ 3,778 |

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- Definition Repurchase and guarantee reserve balances. + References No definition available. + Details
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- Definition Standby repurchase obligations on dealer inventory financing. + References No definition available. + Details
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Namespace Prefix: | tho_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Terms of commitments under repurchase agreements for the repurchase of products sold to dealers. + References No definition available. + Details
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Namespace Prefix: | tho_
Data Type: | us-types:durationStringItemType
Balance Type: | na
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- Details
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Namespace Prefix: | us-gaap_
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