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Summary of Stock Option Shares Activity for the 2008 Plan (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Jul. 31, 2012
Year
Number of Shares  
Outstanding at beginning of period 2,137,436
Granted 572,050
Exercised (181,558)
Cancelled/Expired (42,735)
Outstanding at end of period 2,485,193
Vested or expected to vest at end of period 2,410,118
Exercisable at end of period 1,569,836
Weighted Average Exercise Price Per Share  
Outstanding at beginning of period $ 14.08
Granted $ 15.57
Exercised $ 13.78
Cancelled/Expired $ 15.71
Outstanding at end of period $ 14.42
Vested or expected to vest at end of period $ 14.34
Exercisable at end of period $ 13.38
Weighted Average Remaining Contractual Life  
Outstanding at end of period 7.4
Vested or expected to vest at end of period 7.4
Exercisable at end of period 6.5
Aggregate Intrinsic Value  
Outstanding at end of period $ 6,524
Vested or expected to vest at end of period 6,480
Exercisable at end of period $ 5,665