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Financial instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2012
Oct. 31, 2011
Jan. 31, 2011
Oct. 31, 2010
Carrying amounts and fair values of financial instruments, other than receivables and accounts payable        
Cash and cash equivalents, Carrying Amount $ 49,483 $ 37,408 $ 61,122 $ 42,329
Cash and cash equivalents, Fair Value 49,483      
Notes payable 38 33    
Notes payable, Fair Value 38      
Long-term debt, including current maturities 351,595      
Long-term debt, including current maturities, Fair Value 346,981      
Foreign exchange contracts (net) (600)      
Foreign exchange contracts (net) fair value $ (600)