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Operating segments (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Operating segments (Textuals) [Abstract]
Number of business segments		3
Withdrawal from multiplier pension fund		$ 3,136
Impairment charges related to assets		1,322
Severance cost	$ 347		$ 1,449

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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