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Credit Facility - Additional Information (Detail) (USD $)
 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Oct. 31, 2013
Feb. 17, 2012
Jul. 31, 2014
Minimum
Jul. 31, 2014
Maximum
Jul. 31, 2014
Revolver
Oct. 31, 2013
Revolver
Jul. 31, 2014
Term Loan
Jul. 31, 2014
Term Loan
Jul. 31, 2014
Coverity Inc
Apr. 30, 2014
Coverity Inc
Jul. 31, 2014
Revolver
Apr. 30, 2014
Revolver
Debt Instrument [Line Items]                            
Senior unsecured revolving credit facility entered date Feb. 17, 2012                          
Credit facility maximum borrowing capacity       $ 350,000,000               $ 7,000,000    
Senior unsecured term loan facility, face amount       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.                          
Senior unsecured term loan facility additional borrowings 150,000,000                          
Debt instrument quarterly principal payment 7,500,000                          
Proceeds from credit facility 200,000,000 0                       200,000,000
Principal payments made during period 223,239,000 22,975,000             7,500,000       200,000,000  
Senior unsecured term loan facility 82,500,000   105,000,000                      
Senior unsecured term loan facility long term 52,500,000   75,000,000 [1]                      
Line of Credit Facility, Amount Outstanding             $ 0 $ 0            
Borrowings, interest rate             0.975%     1.125%        
Commitment fees percentage         0.15% 0.30%                
Original credit facility expiration date                     Dec. 31, 2014      
[1] Derived from audited financial statements.