Dividends declaration - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Jan. 15, 2014	Oct. 31, 2013	Oct. 31, 2012
Dividends Payable [Line Items]
Dividends paid, per share	$ 0.07	$ 0.10
Dividends paid		$ (2,349)	$ (1,387)
Dividends Paid
Dividends Payable [Line Items]
Dividends paid		$ 2,300	$ 1,400
Special Dividend
Dividends Payable [Line Items]
Dividends paid, per share		$ 0.07
Two Quarterly Dividend
Dividends Payable [Line Items]
Dividends paid, per share		$ 0.07
Four Quarterly Dividend
Dividends Payable [Line Items]
Dividends paid, per share			$ 0.05