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Stock-Based Compensation - Summarized Activity Related to Restricted Stock Units (Detail) - Restricted Stock Unit [Member]
shares in Thousands
6 Months Ended
Apr. 30, 2016
$ / 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 13
Number of Restricted Shares, Ending balance 13
Weighted-Average Grant Date Fair Value, Granted | $ / shares $ 72.01
Weighted-Average Grant Date Fair Value, Restricted Shares, Ending balance | $ / shares $ 72.01