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Dividends and earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Dividends and earnings per share [Abstract]
Dividends declared (amount)									$ 8,276us-gaap_DividendsCommonStock	$ 10,830us-gaap_DividendsCommonStock	$ 7,637us-gaap_DividendsCommonStock
Dividends declared (per share)	$ 0.30	$ 0.30	$ 0.30	$ 0.30	$ 0.66	$ 0.30	$ 0.30	$ 0.30	$ 1.20	$ 1.56	$ 1.10
Anti-dilutive stock options outstanding									246,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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