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Stock-Based Compensation - Schedule of Shares Available for Future Grant and Shares Reserved for Future Issuance (Details) - shares
shares in Thousands
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Shares available for future grant 305,767 419,071 453,865
Shares reserved for future issuance 343,076 468,531 510,176