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Fire At Bus Production Facility (Schedule Of Gain On Involuntary Conversion) (Details) (USD $)
In Thousands
 12 Months Ended 24 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2011
Fire At Bus Production Facility      
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