Post-Employment Benefits - Summary of Defined Benefit Plan Expense (Parenthetical) (Detail)	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Disclosure of defined benefit plans [abstract]
Discount rate	3.72%	3.72%	4.57%

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard
-URIDate 2017-03-09

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