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Fire At Bus Production Facility (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jan. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Fire At Bus Production Facility [Abstract]      
Amount deductible per the policy   $ 5,000  
Insurance proceeds received for losses incurred     7,578
Business interruption portion of insurance proceeds     4,517
Previously unrecognized insurance recoveries     70
Clean up and other costs     815
Gain on business interruption insurance recovery $ 2,031   $ 6,833