Financial instruments (Details Textuals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Oct. 31, 2011	Oct. 31, 2010
Financial instruments (Textuals) [Abstract]
Maturity of foreign currency forward contracts	90 days
Gains from changes in fair value of contracts	$ (11,277)	$ 7,970
Change in fair value of balance sheet positions denominated in foreign currencies	13,477	(6,749)
Hedge of net investment in foreign operations	$ (170)	$ (999)

Change in fair value of balance sheet positions denominated in foreign currencies.

No definition available.

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- Details

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

+ Details

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- Definition

Date when foreign currency exchange rate derivatives mature or expire.

+ References

No definition available.

+ Details

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- Definition

Current period adjustment in other comprehensive income reflecting gains (losses) on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b(2)

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 52

-Paragraph 20

-Subparagraph a

+ Details

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