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Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]        
Maturity of foreign currency forward contracts     90 days  
Gains (losses) on foreign currency forward contracts $ (1,314) $ 1,520 $ (3,214) $ 2,382
Gains (losses) in fair value of balance sheet positions denominated in foreign currencies $ 1,617 $ (172) $ 2,523 $ (506)