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Cost Reduction Actions (Activity of Facility Related Exit Costs) (Details) (USD $)
 3 Months Ended 9 Months Ended 42 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Jul. 31, 2008
Cost Reduction Actions [Abstract]            
Present value of estimated facility-related exit costs, beginning balance     $ 2,518,000   $ 2,100,000 $ 2,100,000
Cash payments made     (751,000)   (4,047,000)  
Cash payments received     909,000   4,193,000  
Interest accreted on the facility-related exit costs 48,000 41,000 139,000 119,000 569,000  
Present value of estimated facility-related exit costs, ending balance 2,815,000   2,815,000   2,815,000 2,100,000
Amount of facility-related exit cost liability recorded as prepaid expenses 410,000   410,000   410,000  
Facility-related exit cost liability, Noncurrent $ 3,225,000   $ 3,225,000   $ 3,225,000