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Capacity Rationalization Charges Narrative (Details) (USD $)
3 Months Ended 6 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
Restructuring Cost and Reserve        
Charges recognized during the year $ 50,000 $ 0 $ 62,000 $ 0
Estimated expense in remainder of fiscal 2013     $ 2,000