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Financial Instruments - Summary of Significant Unobservable Inputs to Valuation (Detail) - INR (₨) ₨ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Unquoted equity investments [member] | Market multiple approach [member] | Revenue multiple [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Valuation technique		Market multiple approach
Significant unobservable input		Revenue multiple
Movement by		0.5x
Increase		₨ 179
Decrease		₨ (186)
Unquoted equity investments [member] | Third party quote [member] | Forecast Revenues [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Valuation technique	Third party quote
Significant unobservable input	Forecast revenues
Movement by	1.00%
Increase	₨ 18
Decrease	₨ (18)
Unquoted equity investments [member] | Discounted cash flow model [member] | Long term growth rate [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Valuation technique		Discounted cash flow model
Significant unobservable input		Long-term growth rate
Movement by		0.50%
Increase		₨ 55
Decrease		₨ (51)
Unquoted equity investments [member] | Discounted cash flow model [member] | Discount rate [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Significant unobservable input		Discount rate
Movement by		0.50%
Increase		₨ (93)
Decrease		₨ 101
Derivative assets [member] | Market multiple approach [member] | Time to liquidation event [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Significant unobservable input		Time to liquidation event
Movement by		1 year
Increase		₨ 60
Decrease		₨ (69)
Derivative assets [member] | Option pricing model [member] | Volatility of comparable companies [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Valuation technique		Option pricing model
Significant unobservable input		Volatility of comparable companies
Movement by		2.50%
Increase		₨ 31
Decrease		₨ (31)
Contingent consideration [member] | Probability weighted method [member] | Estimated revenue achievement [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Valuation technique		Probability weighted method
Significant unobservable input		Estimated revenue achievement
Movement by		5.00%
Increase		₨ 56
Decrease		₨ (56)
Contingent consideration [member] | Probability weighted method [member] | Estimated earnings achievement [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [line items]
Significant unobservable input		Estimated earnings achievement
Movement by		1.00%

X

- Definition

The amount of decrease in the fair value measurement of assets due to a change in one or more unobservable inputs to reflect reasonably possible alternative assumptions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2017-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
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-URIDate 2017-03-09

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- Definition

The description of inputs used in the fair value measurement of assets. Inputs are the assumptions that market participants would use when pricing the asset, including assumptions about risk such as the risk inherent in a particular valuation technique used to measure fair value (such as a pricing model) and the risk inherent in the inputs to the valuation technique.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2017-01-01
-Paragraph 93
-Subparagraph d
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-URIDate 2017-03-09

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- Definition

The description of the valuation processes used by the entity for the fair value measurement of assets (including, for example, how an entity decides its valuation policies and procedures and analyses changes in fair value measurements from period to period).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2017-01-01
-Paragraph 93
-Subparagraph g
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-URIDate 2017-03-09

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- Definition

The description of the valuation techniques (for example, the market approach, cost approach and income approach) used for the fair value measurement of assets. [Refer: Valuation techniques [member]; Cost approach [member]; Income approach [member]; Market approach [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2017-01-01
-Paragraph 93
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- Definition

The amount of increase in the fair value measurement of assets due to a change in one or more unobservable inputs to reflect reasonably possible alternative assumptions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2017-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
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-URIDate 2017-03-09

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- Definition

Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities.

+ References

No definition available.

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Percentage of increase decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets.

+ References

No definition available.

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