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Fire at Bus Production Facility (Tables) | 12 Months Ended
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Jul. 31, 2012
Schedule of Gain On Involuntary Conversion | For the years ended July 31, 2011 and 2010, a gain on involuntary conversion of $9,417 and $7,593, respectively, was reported in the Company’s Consolidated Statements of Income and Comprehensive Income as follows:
|  | Year Ended July 31, 2011 |  |  | Year Ended July 31, 2010 |  |  | Cumulative Total Since Fire |
Insurance recoveries recognized |  | $ | 10,437 |  |  | $ | 18,079 |  |  | $ | 28,516 |
Deductible |  |  | – |  |  |  | (5,000) |  |  |  | (5,000) |
Work in process and raw material destroyed |  |  | – |  |  |  | (4,305) |  |  |  | (4,305) |
Property and equipment destroyed |  |  | (165) |  |  |  | (578) |  |  |  | (743) |
Clean-up and other costs |  |  | (855) |  |  |  | (603) |  |  |  | (1,458) |
Gain on involuntary conversion |  | $ | 9,417 |  |  | $ | 7,593 |  |  | $ | 17,010 |

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- Definition Schedule of Gain On Involuntary Conversion Reported In Consolidated Statements Of Income and Comprehensive Income [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | tho_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration