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Components of Inventory (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Oct. 31, 2011
Inventory Disclosure [Abstract]    
Raw materials $ 30,400 $ 27,862
Finished goods and work in process 32,937 24,988
Supplies and other 2,567 2,992
Total $ 65,904 $ 55,842