The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_a&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2025-01-01
-Paragraph 28
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_c&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e&doctype=Standard
-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2025-01-01
-Paragraph 23
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23&doctype=Standard
-URIDate 2025-03-27

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_b&doctype=Standard
-URIDate 2025-03-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 95
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_b&doctype=Standard
-URIDate 2025-03-27

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 95
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_b&doctype=Standard
-URIDate 2025-03-27

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 95
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_a&doctype=Standard
-URIDate 2025-03-27

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 95
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_a&doctype=Standard
-URIDate 2025-03-27

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_Assets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash flows from (used in) the entity's financing activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) financing activities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2025-01-01
-Paragraph 33
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2025-en-r&anchor=para_33_c&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash flows from (used in) the entity's investing activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) investing activities]

+ References

+ Details

Name:	ifrs-full_CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash flows from (used in) the entity's operating activities, related to discontinued operations. [Refer: Discontinued operations [member]; Cash flows from (used in) operating activities]

+ References

+ Details

Name:	ifrs-full_CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Total for all subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2025-01-01
-Paragraph 40
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_40_a&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ConsiderationPaidReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_a&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2025-01-01
-Paragraph 28
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_d&doctype=Standard
-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2025-01-01
-Paragraph 23
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23&doctype=Standard
-URIDate 2025-03-27

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2025-01-01
-Paragraph 93
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_b&doctype=Standard
-URIDate 2025-03-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 95
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_b&doctype=Standard
-URIDate 2025-03-27

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 95
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_b&doctype=Standard
-URIDate 2025-03-27

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 95
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_a&doctype=Standard
-URIDate 2025-03-27

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 95
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_a&doctype=Standard
-URIDate 2025-03-27

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_Liabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of assets less the amount of liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 1
-IssueDate 2025-01-01
-Paragraph IG63
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2025-en-r&anchor=para_IG63&doctype=Implementation%20Guidance
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_NetAssetsLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Disclosure of disposal groups classified as held for sale [Line Items].

+ References

No definition available.

+ Details

Name:	rnw_DisclosureOfDisposalGroupsClassifiedAsHeldForSaleLineItems
Namespace Prefix:	rnw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Net gain (loss) on disposal of assets.

+ References

No definition available.

+ Details

Name:	rnw_NetGainLossOnDisposalOfAssets
Namespace Prefix:	rnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of sale of shareholding interest in subsidiary .

+ References

No definition available.

+ Details

Name:	rnw_PercentageOfSaleOfShareholdingInterestInSubsidiary
Namespace Prefix:	rnw_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Solar rooftop project capacity.

+ References

No definition available.

+ Details

Name:	rnw_SolarRooftopProjectCapacity
Namespace Prefix:	rnw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_BusinessCombinationsAxis=rnw_RenewSuryaAayanPrivateLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ContinuingAndDiscontinuedOperationsAxis=rnw_DisposalGroupsDisposedOfBySaleOfSubsidiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BusinessCombinationsAxis=rnw_KoppalNarendraTransmissionLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BusinessCombinationsAxis=rnw_RegentClimateConnectKnowledgeSolutionsPrivateLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BusinessCombinationsAxis=rnw_RenewSunBrightPrivateLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BusinessCombinationsAxis=rnw_GadagTransmissionLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BusinessCombinationsAxis=rnw_RenewSunWavesPrivateLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BusinessCombinationsAxis=rnw_ClimateConnectDigitalLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Disposal group held for sale and disposal of subsidiaries - Additional Information (Detail) ₨ in Millions, $ in Millions												12 Months Ended
	Mar. 10, 2026 INR (₨) Mws	Dec. 24, 2025 INR (₨) Mws	Dec. 02, 2025 INR (₨)	Oct. 08, 2025 INR (₨)	Jun. 24, 2025 INR (₨) Mws	Jun. 06, 2025 INR (₨) Mws	Apr. 22, 2025 INR (₨)	Mar. 07, 2025 INR (₨) Mws	Dec. 19, 2024 INR (₨)	Jun. 21, 2024 INR (₨)	Dec. 30, 2023 INR (₨)	Mar. 31, 2026 INR (₨)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 INR (₨)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 INR (₨)	Mar. 31, 2026 USD ($)
Disclosure of Disposal Groups Classified as Held For Sale [Line Items]
Assets												₨ 1,056,088		₨ 959,799			$ 11,255
Liabilities												911,692		828,687			$ 9,716
ReNew Surya Aayan Private Limited \| Disposal by Sale of Subsidiary
Disclosure of Disposal Groups Classified as Held For Sale [Line Items]
Solar rooftop project capacity \| Mws						300
Total consideration for sale of subsidiary						₨ 310
Net assets						156
Gain (loss) on disposal of assets						154
Cash contributed from (used in) operating activities by disposed group												63		1,042
Cash contributed from (used in) investing activities by disposed group												158		7,390
Cash contributed from (used in) financing activities by disposed group												158		8,037
Koppal- Narendra Transmission Limited \| Disposal by Sale of Subsidiary
Disclosure of Disposal Groups Classified as Held For Sale [Line Items]
Solar rooftop project capacity \| Mws					2,500
Percentage of sale of shareholding interest in subsidiary					51.00%
Total consideration for sale of subsidiary					₨ 1,007	1,007
Net assets					1,481	1,481
Gain (loss) on disposal of assets					₨ (474)	₨ (474)
Cash contributed from (used in) operating activities by disposed group \| $													$ 414		$ 1,088
Cash contributed from (used in) investing activities by disposed group \| $													247		1,124
Cash contributed from (used in) financing activities by disposed group \| $													$ 1,918		$ 380
Regent Climate Connect Knowledge Solutions Private Limited \| Disposal by Sale of Subsidiary
Disclosure of Disposal Groups Classified as Held For Sale [Line Items]
Total consideration for sale of subsidiary							₨ 86
Net assets							84
Assets														94
Liabilities														41
Gain (loss) on disposal of assets							₨ 2
Cash contributed from (used in) operating activities by disposed group												16		10
Cash contributed from (used in) investing activities by disposed group												30		9
Cash contributed from (used in) financing activities by disposed group												0		1
ReNew Sun Bright Private Limited \| Disposal by Sale of Subsidiary
Disclosure of Disposal Groups Classified as Held For Sale [Line Items]
Solar rooftop project capacity \| Mws		300
Total consideration for sale of subsidiary		₨ 7,345		₨ 7,345
Net assets		2,723		2,723
Gain (loss) on disposal of assets		₨ 4,622		₨ 4,622
Cash contributed from (used in) operating activities by disposed group												1,202		1,695
Cash contributed from (used in) investing activities by disposed group												1,057		1,252
Cash contributed from (used in) financing activities by disposed group												150		2,646
Gadag Transmission Limited \| Disposal by Sale of Subsidiary
Disclosure of Disposal Groups Classified as Held For Sale [Line Items]
Solar rooftop project capacity \| Mws	1,000
Percentage of sale of shareholding interest in subsidiary	51.00%
Total consideration for sale of subsidiary	₨ 201		₨ 201
Net assets	970		970
Gain (loss) on disposal of assets	₨ (769)		₨ (769)
Cash contributed from (used in) operating activities by disposed group												161		186
Cash contributed from (used in) investing activities by disposed group												331		679
Cash contributed from (used in) financing activities by disposed group												₨ 662		828
ReNew Sun Waves Private Limited \| Disposal by Sale of Subsidiary
Disclosure of Disposal Groups Classified as Held For Sale [Line Items]
Solar rooftop project capacity \| Mws								300
Total consideration for sale of subsidiary								₨ 5,196	₨ 5,196
Net assets								2,125	2,125
Gain (loss) on disposal of assets								₨ 3,071	₨ 3,071
Cash contributed from (used in) operating activities by disposed group														1,570		₨ 1,722
Cash contributed from (used in) investing activities by disposed group														791		920
Cash contributed from (used in) financing activities by disposed group														₨ 1,962		₨ 929
Climate Connect Digital Limited \| Disposal by Sale of Subsidiary
Disclosure of Disposal Groups Classified as Held For Sale [Line Items]
Total consideration for sale of subsidiary										₨ 4	₨ 4
Net assets										(13)	13
Gain (loss) on disposal of assets										₨ 17	₨ 17