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Non-Current Provisions - Additional Information (Detail) - yr	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Noncurrent Provisions [Abstract]
Retirement age of employee	65	65	65

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- Definition

Disclosure Of Noncurrent Provisions [Abstract]

+ References

No definition available.

+ Details

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- Definition

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

+ References

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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