Credit Facility - Additional Information (Detail) (USD $)	6 Months Ended
	Apr. 30, 2014	Oct. 31, 2013		Feb. 17, 2012
Debt Instrument [Line Items]
Senior unsecured revolving credit facility entered date	Feb. 17, 2012
Credit facility maximum borrowing capacity				$ 350,000,000
Senior unsecured term loan facility, face amount				150,000,000
Senior unsecured term loan facility additional borrowings	150,000,000
Payment schedule for term loan	Principal payments on a portion of the Term Loan are due in equal quarterly installments of $7.5 million, with the remainder due when the Credit Agreement expires in October 2016.
Debt instrument periodic payment principal	7,500,000
Senior unsecured term loan facility	90,000,000	105,000,000
Senior unsecured term loan facility long term	60,000,000	75,000,000	[1]
Minimum
Debt Instrument [Line Items]
Commitment fees percentage	0.15%
Maximum
Debt Instrument [Line Items]
Commitment fees percentage	0.30%
Revolver
Debt Instrument [Line Items]
Senior unsecured term loan facility	200,000,000
Borrowings, interest rate	0.975%
Drew down amount	200,000,000
Term Loan
Debt Instrument [Line Items]
Borrowings, interest rate	1.125%
Coverity Inc
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	7,000,000
Credit facility expiration date	Dec. 31, 2014
Credit facility amount outstanding	$ 0

[1] Derived from audited financial statements.