Capital Shares - Additional Information (Detail) - shares	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Equity [Line Items]
Convertible preferred shares, authorized (in shares)	10,000,000	10,000,000
Common shares, authorized (in shares)	160,000,000	160,000,000
Common shares, issued (in shares)	98,023,000	98,023,000
Common Shares Outstanding (in shares)	58,081,000	57,600,000
Preferred Class A
Equity [Line Items]
Convertible preferred shares, authorized (in shares)	10,000,000	10,000,000
Convertible preferred shares, outstanding (in shares)	0	0	0