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Cost Reduction Actions - Activity of Facility Related Exit Costs (Details) (USD $)
 3 Months Ended 6 Months Ended 63 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jul. 31, 2008
Cost Reduction Actions [Abstract]            
Present value of estimated facility-related exit costs, beginning balance     $ 3,331,000   $ 2,100,000 $ 2,100,000
Cash payments made     (528,000)   (5,855,000)  
Cash payments received     625,000   6,347,000  
Accreted interest recorded 61,000 53,000 120,000 105,000 956,000  
Present value of estimated facility-related exit costs, ending balance 3,548,000   3,548,000   3,548,000 2,100,000
Amount recorded as prepaid expenses in the Condensed Consolidated Balance Sheet 454,000   454,000   454,000  
Amount recorded as other liabilities in the Condensed Consolidated Balance Sheet $ 4,002,000   $ 4,002,000   $ 4,002,000