v3.26.1
Business Combination - Additional Information (Detail)
₨ / shares in Units, $ / shares in Units, ₨ in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Aug. 28, 2025
shares
Mar. 19, 2024
INR (₨)
Jul. 01, 2023
INR (₨)
shares
Jun. 30, 2023
INR (₨)
shares
Mar. 31, 2024
INR (₨)
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2023
$ / shares
Apr. 04, 2022
₨ / shares
shares
Business Acquisition [Line Items]                        
Goodwill         ₨ 1,629,510.3 ₨ 1,629,510.3   ₨ 1,629,510.3 $ 17,366.6 $ 17,366.6    
Goodwill written off related to sale of business unit           ₨ 0.0 $ 0.0 ₨ 0.0        
Pro Data Basis Bonus Issue           Pursuant to the Scheme of Amalgamation dated April 04, 2022 (“Scheme”) and as amended, eHDFC shareholders received 42 shares (face value Rs.1 each) of the Bank, as consideration, for every 25 shares (face value Rs.2 each) held in eHDFC (prior to giving effect to the 1:1 bonus issue on August 28, 2025 by the Bank) Pursuant to the Scheme of Amalgamation dated April 04, 2022 (“Scheme”) and as amended, eHDFC shareholders received 42 shares (face value Rs.1 each) of the Bank, as consideration, for every 25 shares (face value Rs.2 each) held in eHDFC (prior to giving effect to the 1:1 bonus issue on August 28, 2025 by the Bank)          
eHDFC [Member]                        
Business Acquisition [Line Items]                        
Business acquisition, percentage of voting interests acquired     100.00%                  
Number of shares received | shares                       42
Number of shares held for each set of shares received | shares                       25
Business acquisition, effective date of acquisition     Jul. 01, 2023                  
Business combination, consideration transferred       ₨ 5,337,741.5                
Business acquisition, share price | $ / shares                     $ 1,701.4  
Business acquisition, equity interest issued or issuable, number of shares | shares 6,220,792,984     3,110,396,492                
Share based compensation by share based award number of shares underlying such awards post business combination | shares 96,923,690   48,461,845                  
Class of warrants or rights outstanding | shares 49,585,536   24,792,768                  
Goodwill     ₨ 1,628,148.5   1,628,148.5              
Indefinite-lived intangible assets, purchase accounting adjustments     1,434,818.1                  
Business acquisition, transaction costs     ₨ 1,900.0                  
Per share value of shares received | ₨ / shares                       ₨ 1
Per share value of shares held for each set of shares received | ₨ / shares                       ₨ 2
eHDFC [Member] | Equity Interest [Member]                        
Business Acquisition [Line Items]                        
Equity ownership interest of the bank's largest shareholder     20.80%                  
eHDFC [Member] | HDFC Credila Financial Services Limited [Member]                        
Business Acquisition [Line Items]                        
Disposal group, including discontinued operation, assets     ₨ 103,500.0                  
Goodwill written off related to sale of business unit   ₨ 73,576.1     ₨ 73,576.1              
eHDFC [Member] | HDFC Credila Financial Services Limited [Member] | Brand [Member]                        
Business Acquisition [Line Items]                        
Indefinite lived intangible assets written off related to sale of business unit     8,527.5                  
eHDFC [Member] | HDFC Credila Financial Services Limited [Member] | Distribution Service [Member]                        
Business Acquisition [Line Items]                        
Indefinite lived intangible assets written off related to sale of business unit     8,972.4                  
eHDFC [Member] | HDFC Education and Development Services Limited [Member]                        
Business Acquisition [Line Items]                        
Disposal group, including discontinued operation, assets     1,976.0                  
Goods and Service Tax [Member] | eHDFC [Member]                        
Business Acquisition [Line Items]                        
Business combination recognized identifiable asset acquired and liabilities assumed contingent liability     ₨ 11,063.0