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Stock-Based Compensation - Summarized Activity Related to Restricted Stock Units (Detail) - Restricted Stock Unit [Member]
shares in Thousands
12 Months Ended
Oct. 31, 2017
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Restricted Shares, Beginning balance 0
Number of Restricted Share Units, Granted 10
Number of Restricted Share Units, Vested (10)
Number of Restricted Shares, Ending balance 0
Weighted-Average Grant Date Fair Value, Granted | $ / shares $ 97.43
Weighted-Average Grant Date Fair Value, Vested | $ / shares $ 97.43