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Financial instruments (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Financial instruments (Textual) [Abstract]
Maturity of foreign currency forward contracts	less than 90 days
Gains/Losses on foreign exchange contracts	$ 976	$ 10,790
Change in fair value of Balance Sheet positions denominated in foreign currencies	$ 1,151	$ 11,426

Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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