v3.26.1
Goodwill and Intangible Assets - Summary of Movement in Intangible Assets (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Disclosure of detailed information about intangible assets [line items]      
Beginning balance ₨ 27,450    
Ending balance 29,176 $ 311 ₨ 27,450
Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 52,183   55,644
Acquisition through Business combinations (Refer to Note 7) 6,753   1,896
Deductions/adjustments (4,420)   (6,619)
Translation adjustment 5,509   1,262
Ending balance 60,025   52,183
Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 24,733   22,896
Amortization and impairment [1] 7,787   7,909
Deductions/adjustments (4,420)   (6,619)
Translation adjustment 2,749   547
Ending balance 30,849   24,733
Net carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 27,450    
Ending balance 29,176   27,450
Customer related intangibles [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 42,461   43,672
Acquisition through Business combinations (Refer to Note 7) 5,644   1,896
Deductions/adjustments (4,420)   (4,101)
Translation adjustment 4,387   994
Ending balance 48,072   42,461
Customer related intangibles [member] | Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 20,950   18,281
Amortization and impairment [1] 6,599   6,327
Deductions/adjustments (4,420)   (4,101)
Translation adjustment 2,252   443
Ending balance 25,381   20,950
Customer related intangibles [member] | Net carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 21,511    
Ending balance 22,691   21,511
Marketing related intangibles [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 9,722   11,972
Acquisition through Business combinations (Refer to Note 7) 1,109   0
Deductions/adjustments (0)   (2,518)
Translation adjustment 1,122   268
Ending balance 11,953   9,722
Marketing related intangibles [member] | Accumulated amortization and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 3,783   4,615
Amortization and impairment [1] 1,188   1,582
Deductions/adjustments (0)   (2,518)
Translation adjustment 497   104
Ending balance 5,468   3,783
Marketing related intangibles [member] | Net carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 5,939    
Ending balance ₨ 6,485   ₨ 5,939
[1] During the years ended March 31, 2025 and 2026, a decline in the revenue and earnings estimates led to a revision of recoverable value of customer-relationship intangible assets and marketing related intangible assets recognized on business combinations. Consequently, the Company has recognized impairment charge ₹ 1,155 and ₹ 851 for the years ended March 31, 2025 and 2026, respectively, as part of amortization and impairment.

Amortization expense on intangible assets is included in selling and marketing expenses in the consolidated statement of income.