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Income taxes Income taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Oct. 31, 2012 Rate	Oct. 31, 2011 Rate
Income tax [Abstract]
effective income tax rate			(8.00%)	1174.40%
Net operating loss carried back	$ 3.3
Deferred tax assets credit carryforward-RD	0.7
tax expense associated with the repatriation of foreign earnings		1.8
repatriation of foreign earnings		3.1
Operating loss carryforwards	$ 7.8

The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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- 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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