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Income taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Oct. 31, 2013	Oct. 31, 2012
Income taxes [Abstract]
Period of cumulative loss incurred, minimum						4 years
Period of cumulative loss incurred, maximum						7 years
Effective tax rate, (expense) benefit (in hundredths)	0.00%	(126.90%)	0.00%	(124.20%)	0.00%
Change in deferred tax assets valuation allowance		$ 15.2

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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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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