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Inventories (Tables) | 12 Months Ended
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Jul. 31, 2012
Schedule of Major Classifications of Inventories | Major classifications of inventories are:
|  | July 31, |
|  | 2012 |  |  | 2011 |
Finished products |  | $ | 16,570 |  |  | $ | 14,179 |
Work in process |  |  | 59,803 |  |  |  | 48,575 |
Raw materials |  |  | 104,446 |  |  |  | 104,360 |
Chassis |  |  | 39,044 |  |  |  | 46,548 |
Subtotal |  |  | 219,863 |  |  |  | 213,662 |
Excess of FIFO costs over LIFO costs |  |  | (33,780) |  |  |  | (29,164) |
Total inventories |  | $ | 186,083 |  |  | $ | 184,498 |

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic -SubTopic -Publisher SEC -Number 210 -Article 5 -Subparagraph a,b,c -Name Regulation S-X (SX) -Paragraph 6 -Section 2 + Details
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