Capital Shares - Additional Information (Detail) - $ / shares	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
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	57,715,000	57,307,000
Preferred Class A [Member]
Equity [Line Items]
Convertible preferred shares, authorized	10,000,000
Convertible preferred shares, No par value
Convertible preference shares outstanding	0	0	0