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Stock Compensation - Summary of Unvested Restricted Stock Units Outstanding (Detail) - Restricted Stock Units [Member]
12 Months Ended
Oct. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding Balance | shares 59,192
Granted | shares 417,197
Exercised | shares (17,637)
Cancelled | shares (44,719)
Outstanding Balance | shares 414,033
Outstanding Balance | $ / shares $ 25.44
Granted | $ / shares 26.18
Exercised | $ / shares 25.37
Cancelled | $ / shares 28.78
Outstanding Balance | $ / shares $ 25.83