Additional Information Regarding Company's Outstanding Stock Options (Detail) (USD $)	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Shares
Aggregate intrinsic value of options exercised during year	$ 6,900,000
Stock Option
Shares
Options outstanding at beginning of year	2,004,781	2,099,672
Options granted	176,267	114,815
Options exercised	(1,096,750)	(192,738)
Options forfeited	(96,083)	(16,968)
Options outstanding at end of year	988,215	2,004,781
Options exercisable at end of year	743,169	1,650,289
Options vested and expected to vest at end of year	972,015	1,987,333
Option price range at beginning of year	$ 0.05	$ 0.05
Option price range at end of year	$ 6.42	$ 4.12
Aggregate intrinsic value of options exercised during year	$ 4,137,000	$ 397,000
Weighted average exercise price
Options outstanding at beginning of year	$ 2.25	$ 2.13
Options granted	$ 4.80	$ 3.86
Options exercised	$ 2.52	$ 1.82
Options forfeited	$ 4.01	$ 3.05
Options outstanding at end of year	$ 2.24	$ 2.25
Options exercisable at end of year	$ 1.96	$ 2.16
Options vested and expected to vest at end of year	$ 2.21	$ 2.25