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Income taxes (Details)	3 Months Ended
Income taxes (Details)	Jan. 31, 2014	Jan. 31, 2013
Income taxes [Abstract]
Effective tax rate, (expense) benefit (in hundredths)	0.00%	0.70%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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