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Financial Instruments - Percentage of Revenue Generated from Top Customer and Top Five Customers (Detail)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Top customer [Member]
Disclosure of major customers [line items]
Percentage of revenue generated from customers	6.80%	9.00%	10.90%
Top five customers [Member]
Disclosure of major customers [line items]
Percentage of revenue generated from customers	29.40%	32.10%	30.70%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2017-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_34&doctype=Standard
-URIDate 2017-03-09

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