Capital Shares - Additional Information (Detail) - $ / shares	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Equity [Line Items]
Convertible preferred shares, authorized	10,000,000	10,000,000
Convertible preferred shares, No par value
Common shares, authorized	160,000,000	160,000,000
Common shares, issued	98,023,000	98,023,000
Common Shares Outstanding	57,600,000	58,037,000
Preferred Class A [Member]
Equity [Line Items]
Convertible preferred shares, authorized	10,000,000
Convertible preferred shares, No par value
Convertible preferred shares, outstanding	0	0	0