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Segment reporting (Details)
₨ in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2025
INR (₨)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
INR (₨)
Mar. 31, 2023
INR (₨)
Disclosure of segment reporting [Line Items]        
External Customers ₨ 39,885,580 $ 466,054 ₨ 35,633,922 ₨ 33,403,726
Unallocated expenses:        
Depreciation and amortization (5,633,054) (65,821) (4,773,414) (3,971,865)
Other income / (expense), net 363,968 4,253 378,973 324,021
Finance income 12,632 148 108 10,291
Profit / (loss) before tax (286,412) (3,346) 352,039 1,021,021
Income tax (expense) / benefit (498,546) (5,825) (183,100) (346,499)
Profit / (loss) for the year (2,256,791) $ (26,370) (2,399,411) (2,647,757)
Network Connectivity Services        
Disclosure of segment reporting [Line Items]        
External Customers 15,781,397   14,661,136 13,290,510
Intersegment Revenues 0   0 0
Operating expenses (13,919,660)   (12,319,398) (11,125,798)
Intersegment Expenses (251,796)   (251,796) (250,085)
Segment operating income / (loss) 1,609,941   2,089,942 1,914,627
Data Center Services        
Disclosure of segment reporting [Line Items]        
External Customers 14,195,939   11,053,956 10,125,610
Intersegment Revenues 87,753   87,753 87,749
Operating expenses (7,768,474)   (6,425,331) (6,085,634)
Intersegment Expenses 0   0 0
Segment operating income / (loss) 6,515,218   4,716,378 4,127,725
Total Segments [Member]        
Disclosure of segment reporting [Line Items]        
External Customers 39,885,580   35,633,922 33,403,726
Intersegment Revenues 309,214   309,214 307,503
Operating expenses (32,299,980)   (28,849,641) (27,110,545)
Intersegment Expenses (309,214)   (309,214) (307,503)
Segment operating income / (loss) 7,585,600   6,784,281 6,293,181
Unallocated expenses:        
Support Service Unit Costs (59,723)   9,571 2,420
Depreciation and amortization (5,633,054)   (4,773,414) (3,971,865)
Other income / (expense), net 551,812   535,127 363,733
Finance income 12,632   108 10,291
Finance expenses (2,743,679)   (2,203,634) (1,676,739)
Profit / (loss) before tax (286,412)   352,039 1,021,021
Income tax (expense) / benefit (498,546)   (183,100) (346,499)
Profit / (loss) for the year (784,958)   168,939 674,522
Digital Services        
Disclosure of segment reporting [Line Items]        
External Customers 9,908,244   9,918,830 9,987,606
Intersegment Revenues 221,461   221,461 219,754
Operating expenses (10,611,846)   (10,104,912) (9,899,113)
Intersegment Expenses (57,418)   (57,418) (57,418)
Segment operating income / (loss) ₨ (539,559)   ₨ (22,039) ₨ 250,829