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Stock-Based Compensation - Summarized Activity Related to Restricted Stock (Detail) - Restricted Stock [Member]
shares in Thousands
9 Months Ended
Jul. 31, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Restricted Shares, Beginning balance | shares 53
Number of Restricted Shares, Granted | shares 40
Number of Restricted Shares, Vested | shares (26)
Number of Restricted Shares, Ending balance | shares 67
Weighted-Average Grant Date Fair Value, Restricted Shares, Beginning balance | $ / shares $ 108.82
Weighted-Average Grant Date Fair Value, Granted | $ / shares 131.19
Weighted-Average Grant Date Fair Value, Vested | $ / shares 97.84
Weighted-Average Grant Date Fair Value, Restricted Shares, Ending balance | $ / shares $ 126.30