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Intangible assets (Details 1) - INR (₨) ₨ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Apr. 01, 2023
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Intangible Assets Other Than Goodwill | ₨ 696,873 | ₨ 641,862 | ₨ 622,688
Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Balance at beginning | 3,646,384 | 3,138,468 |
Acquisitions during the year | 466,678 | 508,172 |
Disposals during the year | 50,968 | 256 |
Balance at ending | 4,062,094 | 3,646,384 |
Accumulated depreciation [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Balance at beginning | (3,004,522) | (2,515,780) |
Acquisitions during the year | 406,180 | 488,896 |
Disposals during the year | (45,481) | (154) |
Balance at ending | (3,365,221) | (3,004,522) |
Bandwidth Capacity [Member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Intangible Assets Other Than Goodwill | 175 | 1,575 | 90,791
Bandwidth Capacity [Member] | Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Balance at beginning | 773,288 | 773,288 |
Acquisitions during the year | 0 | 0 |
Disposals during the year | 0 | 0 |
Balance at ending | 773,288 | 773,288 |
Bandwidth Capacity [Member] | Accumulated depreciation [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Balance at beginning | (771,713) | (682,497) |
Acquisitions during the year | 1,400 | 89,216 |
Disposals during the year | 0 |  |
Balance at ending | (773,113) | (771,713) |
Computer software [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Intangible Assets Other Than Goodwill | 671,600 | 612,039 | 500,499
Computer software [member] | Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Balance at beginning | 2,795,096 | 2,287,180 |
Acquisitions during the year | 466,678 | 508,172 |
Disposals during the year | 50,968 | 256 |
Balance at ending | 3,210,806 | 2,795,096 |
Computer software [member] | Accumulated depreciation [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Balance at beginning | (2,183,057) | (1,786,681) |
Acquisitions during the year | 401,630 | 396,530 |
Disposals during the year | (45,481) | (154) |
Balance at ending | (2,539,206) | (2,183,057) |
Licences and franchises [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Intangible Assets Other Than Goodwill | 25,098 | 28,248 | ₨ 31,398
Licences and franchises [member] | Gross carrying amount [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Balance at beginning | 78,000 | 78,000 |
Acquisitions during the year | 0 | 0 |
Disposals during the year | 0 | 0 |
Balance at ending | 78,000 | 78,000 |
Licences and franchises [member] | Accumulated depreciation [member] |  |  |
Disclosure Of Intangible Assets And Goodwill Explanatory [Line Items] |  |  |
Balance at beginning | (49,752) | (46,602) |
Acquisitions during the year | 3,150 | 3,150 |
Disposals during the year | 0 |  |
Balance at ending | ₨ (52,902) | ₨ (49,752) |

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- Definition The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Total for all business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_c&doctype=Standard -URIDate 2024-03-27 + Details
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