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Computation of Basic and Diluted Net Income Per Share Determined Using Net Income Applicable to Common Shareholders as Numerator and Number of Shares Included in Denominator (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]        
Net income $ 3,957 $ 4,575 $ 11,552 $ 8,470
Allocated to participating Shares (34) (22) (99) (40)
Net income applicable to common shareholders 3,923 4,553 11,453 8,430
Weighted average shares Outstanding 6,447 6,441 6,444 6,441
Stock options            
Basic 6,447 6,441 6,444 6,441
Income per share $ 0.61 $ 0.71 $ 1.78 $ 1.31
Net income 3,957 4,575 11,552 8,470
Allocated to participating Shares (34) (22) (99) (40)
Net income applicable to common shareholders $ 3,923 $ 4,553 $ 11,453 $ 8,430
Weighted average shares Outstanding 6,447 6,441 6,444 6,441
Stock options 18 39 26 33
Diluted 6,465 6,480 6,470 6,474
Income per share $ 0.61 $ 0.70 $ 1.77 $ 1.30