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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)