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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Components of Accounts Receivables (Details) - USD ($)
$ in Thousands
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract]        
Accounts receivable $ 394,314 $ 354,688    
Unbilled accounts receivables 47,760 33,567    
Total accounts receivable 442,074 388,255    
Accounts receivable, allowances (3,201) (2,561) $ (2,026) $ (4,253)
Total accounts receivable, net $ 438,873 $ 385,694