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Other Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 08, 2014
Jul. 31, 2015
Jul. 31, 2015
Jul. 31, 2014
Other Events [Abstract]        
Dividend payment $ 0.75      
Dividend aggregate amount to shareholders $ 13,000   $ 12,970 $ 11,005
Dividend record date     Nov. 17, 2014  
Loss contingency, period of occurrence     In January 2015, various class action lawsuits, which have been consolidated into a single lawsuit during our second fiscal quarter, were initiated against the company related to the restatement of previously-issued financial statements.  
Legal Fees   $ 200