XML 29 R38.htm IDEA: XBRL DOCUMENT v3.19.2
Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization expense $ 4.1 $ 4.6 $ 13.3 $ 13.7