| Quarterly Financials |  Mar 2015   |  Jun 2015   |  Sept 2015   |  Dec 2015   |  Mar 2016   |  Jun 2016   |  Sept 2016   |  Dec 2016   |  Mar 2017   |  Jun 2017   |  Sept 2017   |  Dec 2017   |  Mar 2018   |  Jun 2018   |  Sept 2018   |  Dec 2018   |  Mar 2019   |  Jun 2019   |  Sept 2019   |  Dec 2019   |  Mar 2020   |  Jun 2020   |  Sept 2020   |  Dec 2020   |  Mar 2021   |  Jun 2021   |  Sept 2021   |  Dec 2021   |  Mar 2022   |  Jun 2022   |  Sept 2022   |  Dec 2022   |  Mar 2023   |  Jun 2023   |  Sept 2023   |  Dec 2023   |  Mar 2024   |  Jun 2024   |  Sept 2024   |  Dec 2024   |  Mar 2025   |  Jun 2025   |  Sept 2025   | 
|  Revenue  |  218   |  247   |  242   |  249   |  313   |  325   |  331   |  345   |  356   |  355   |  372   |  409   |  457   |  476   |  529   |  524   |  536   |  584   |  615   |  655   |  386   |  169   |  173   |  226   |  222   |  212   |  200   |  216   |  44   |  62   |  67   |  52   |  36   |  4   |  1   |  4   |  0   |  0   |  0   |  51   |  2   |  0   |  7   | 
| Expenses |  168   |  181   |  191   |  198   |  248   |  259   |  263   |  274   |  287   |  288   |  301   |  328   |  363   |  374   |  411   |  433   |  453   |  473   |  502   |  543   |  526   |  369   |  248   |  211   |  247   |  179   |  174   |  225   |  762   |  83   |  70   |  55   |  84   |  8   |  2   |  2   |  110   |  3   |  1   |  3   |  6   |  1   |  0   | 
|  EBITDA  |  50   |  67   |  51   |  51   |  65   |  66   |  68   |  72   |  70   |  67   |  71   |  81   |  93   |  102   |  119   |  91   |  83   |  110   |  113   |  112   |  -139   |  -199   |  -74   |  15   |  -25   |  33   |  26   |  -9   |  -718   |  -20   |  -3   |  -3   |  -48   |  -4   |  -1   |  2   |  -110   |  -3   |  -1   |  48   |  -5   |  -1   |  7   | 
| Operating Profit % |  22 %  |  21 %  |  21 %  |  20 %  |  20 %  |  18 %  |  20 %  |  20 %  |  19 %  |  19 %  |  19 %  |  20 %  |  20 %  |  20 %  |  20 %  |  17 %  |  15 %  |  19 %  |  17 %  |  17 %  |  -42 %  |  -122 %  |  -45 %  |  2 %  |  -12 %  |  15 %  |  12 %  |  -8 %  |  -1,761 %  |  -44 %  |  -61 %  |  -8 %  |  -123 %  |  -118 %  |  -2,900 %  |  0 %  |  0 %  |  0 %  |  0 %  |  0 %  |  0 %  |  0 %  |  0 %  | 
| Depreciation |  14   |  19   |  18   |  19   |  18   |  20   |  23   |  23   |  21   |  21   |  23   |  28   |  32   |  33   |  39   |  42   |  40   |  45   |  41   |  41   |  40   |  30   |  29   |  28   |  28   |  25   |  26   |  23   |  5   |  5   |  4   |  4   |  4   |  0   |  0   |  0   |  0   |  0   |  0   |  0   |  0   |  0   |  0   | 
| Interest |  3   |  3   |  4   |  3   |  5   |  7   |  6   |  5   |  5   |  5   |  6   |  5   |  6   |  5   |  6   |  6   |  9   |  10   |  10   |  11   |  10   |  10   |  9   |  9   |  8   |  11   |  8   |  9   |  2   |  2   |  1   |  1   |  4   |  1   |  1   |  1   |  1   |  1   |  1   |  1   |  0   |  0   |  0   | 
|  Profit Before Tax  |  33   |  45   |  29   |  29   |  42   |  39   |  40   |  44   |  43   |  41   |  42   |  49   |  56   |  63   |  74   |  44   |  35   |  55   |  62   |  60   |  -190   |  -240   |  -113   |  -23   |  -62   |  -3   |  -7   |  -41   |  -725   |  -27   |  -8   |  -8   |  -56   |  -5   |  -2   |  1   |  -110   |  -4   |  -2   |  48   |  -5   |  -1   |  6   | 
| Tax |  0   |  3   |  3   |  4   |  11   |  5   |  7   |  6   |  1   |  6   |  6   |  7   |  10   |  9   |  13   |  8   |  8   |  9   |  11   |  9   |  -31   |  1   |  3   |  3   |  7   |  1   |  2   |  1   |  0   |  -1   |  0   |  2   |  -0   |  0   |  -0   |  4   |  1   |  0   |  -0   |  0   |  0   |  0   |  0   | 
| Net Profit |  33   |  42   |  26   |  25   |  32   |  34   |  32   |  38   |  42   |  36   |  37   |  42   |  46   |  54   |  61   |  36   |  27   |  46   |  51   |  51   |  -159   |  -241   |  -116   |  -26   |  -68   |  -3   |  -9   |  -42   |  -725   |  -26   |  -8   |  -10   |  -56   |  -5   |  -2   |  -2   |  -111   |  -4   |  -2   |  48   |  -5   |  -1   |  6   | 
| EPS in ₹ |  2.26   |  3.29   |  2.09   |  2.00   |  2.59   |  2.87   |  2.18   |  2.81   |  3.36   |  2.76   |  2.85   |  3.13   |  3.45   |  3.66   |  4.12   |  2.45   |  1.90   |  3.09   |  3.42   |  3.45   |  -10.81   |  -16.55   |  -7.96   |  -1.74   |  -4.66   |  -0.22   |  -0.61   |  -2.86   |  -49.81   |  -1.79   |  -0.57   |  -0.70   |  -3.83   |  -0.36   |  -0.11   |  -0.15   |  -7.56   |  -0.26   |  -0.11   |  3.26   |  -0.33   |  -0.06   |  0.43   | 










