Earnings per Share and Stock-Based Compensation - Schedule of Changes in Shares Under Option, Excluding Performance Based Options (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Jan. 31, 2013
Stockholders' Equity [Line Items]
Outstanding shares, beginning balance	12,325,499
Granted, Shares
Exercised, Shares	(826,294)
Canceled, Shares	(977,572)
Outstanding shares, ending balance	10,521,633
Options exercisable, ending balance	7,366,037
Outstanding, Weighted Average Price, beginning balance	$ 4.49
Granted, Weighted Average Price
Exercised, Weighted Average Price	$ 3.34
Canceled, Weighted Average price	$ 6.48
Outstanding, Weighted Average Price, ending balance	$ 4.39
Options exercisable, Weighted Average Price, ending balance	$ 4.70
Outstanding, Weighted Average Life	5 years 6 months
Options exercisable, Weighted Average Life ending balance	5 years
Exercised , Aggregate Intrinsic Value	$ 1,396
Outstanding, Aggregate Intrinsic Value, ending balance	27,842
Options exercisable, Aggregate Intrinsic Value	$ 18,829

Earnings per Share and Stock-Based Compensation - Schedule of Changes in Shares Under Option, Excluding Performance Based Options (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified

3 Months Ended

Jan. 31, 2013

Outstanding shares, beginning balance

12,325,499

Granted, Shares

Exercised, Shares

(826,294)

Canceled, Shares

(977,572)

Outstanding shares, ending balance

10,521,633

Options exercisable, ending balance

7,366,037

Outstanding, Weighted Average Price, beginning balance

$ 4.49

Granted, Weighted Average Price

Exercised, Weighted Average Price

$ 3.34

Canceled, Weighted Average price

$ 6.48

Outstanding, Weighted Average Price, ending balance

$ 4.39

Options exercisable, Weighted Average Price, ending balance

$ 4.70

Outstanding, Weighted Average Life

5 years 6 months

Options exercisable, Weighted Average Life ending balance

5 years

Exercised , Aggregate Intrinsic Value

$ 1,396

Outstanding, Aggregate Intrinsic Value, ending balance

27,842

Options exercisable, Aggregate Intrinsic Value

$ 18,829

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