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Commitments and Contingencies - Additional Information (Detail)
ft² in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Oct. 10, 2014
USD ($)
Jan. 31, 2015
ft²
Building
Oct. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Oct. 31, 2013
USD ($)
Loss Contingencies [Line Items]          
Rent expenses     $ 67.6 $ 65.6 $ 64.4
Number of buildings to be leased | Building   2      
Total square feet of buildings | ft²   341      
Lease renewal term, in years   10 years      
Second lease renewal term, years   9 years      
Mentor litigation          
Loss Contingencies [Line Items]          
Jury verdict assessing damages, value $ 36.0