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Income tax provision - Additional Information (Detail) (USD $)	3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Income Taxes [Line Items]
Provision for income tax as percentage of income before income taxes	28.20%	47.40%
Unrecognized tax benefits	$ 0	$ 0
Accrued interest and penalties related to uncertain tax positions	$ 0	$ 0

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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