Goodwill And Intangible Assets - Summary of Key Assumptions Used (Details)	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Disclosure Of Key Assumptions Used [Line Items]
Discount rate	13.50%	14.40%
Bottom of Range
Disclosure Of Key Assumptions Used [Line Items]
Long term growth rate	8.00%	8.00%
Operating margins	17.00%	17.00%
Top of Range
Disclosure Of Key Assumptions Used [Line Items]
Long term growth rate	10.00%	10.00%
Operating margins	20.00%	20.00%

The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2017-01-01
-Paragraph 134
-Subparagraph d
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_iv&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2017-01-01
-Paragraph 134
-Subparagraph e
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_iv&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant