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Inventories
 9 Months Ended
Apr. 30, 2011
Inventories [Abstract]  
Inventories
3.   Inventories
    Major classifications of inventories are as follows:
                 
    April 30, 2011     July 31, 2010  
Raw materials
  $ 103,558     $ 78,481  
Chassis
    61,629       33,335  
Work in process
    54,886       46,681  
Finished goods
    31,065       9,681  
 
           
Total
    251,138       168,178  
Excess of FIFO costs over LIFO costs
    (27,148 )     (25,498 )
 
           
Total inventories
  $ 223,990     $ 142,680  
 
           
    Of the $251,138 of inventory at April 30, 2011, all but $31,272 at certain subsidiaries is valued on a last-in, first-out basis. The $31,272 of inventory is valued on a first-in, first-out method.