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Inventories (Schedule Of Major Classifications Of Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2012
Jul. 31, 2011
Inventories [Abstract]    
Raw materials $ 101,458 $ 104,360
Chassis 42,576 46,548
Work in process 56,591 48,575
Finished goods 21,764 14,179
Total 222,389 213,662
Excess of FIFO costs over LIFO costs (30,164) (29,164)
Total inventories $ 192,225 $ 184,498