v3.26.1
Retirement Benefits - Additional Information (Detail)
₨ in Thousands, $ in Millions
 12 Months Ended
Mar. 31, 2026
INR (₨)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
INR (₨)
Mar. 31, 2024
INR (₨)
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, expected past service cost amortization for the next fiscal year ₨ 1,636,600      
Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Average Remaining Service Period For Past Service Cost 1 year 1 year    
Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Average Remaining Service Period For Past Service Cost 13 years 13 years    
Superannuation        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary 13.00% 13.00%    
Defined contribution plan, employer contribution recognized as an expense ₨ 4,099,400   ₨ 3,576,800 ₨ 3,106,600
Superannuation | Managing Director, Executive Directors and for certain employees of CBoP        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary 15.00% 15.00%    
Provident Fund        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary 12.00% 12.00%    
Defined contribution plan, employer contribution recognized as an expense ₨ 13,136,600   12,569,000 11,683,900
Defined contribution plan - contribution to Pension Scheme administered by Regional Provident Fund Commissioner, percentage considered - lower of the percentage of employees eligible salary or fixed amount 8.33% 8.33%    
Provident Fund | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions ₨ 15      
National Pension Scheme [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer contribution recognized as an expense ₨ 654,600   310,000 ₨ 161,600
Gratuity        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, number of days of eligible salary payable for each completed year of service 15 days 15 days    
Defined benefit plan, expected contribution to the plan for the next fiscal year ₨ 12,393,800      
Defined benefit plan, accumulated benefit obligation 24,373,100   15,065,600  
Employer contributions 1,988,400 $ 21.2 1,010,200  
Gratuity | Vested accumulated benefit obligation        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, accumulated benefit obligation ₨ 22,108,900   13,143,100  
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, vesting period 15 years 15 years    
Defined benefit plan, expected contribution to the plan for the next fiscal year     123,400  
Defined benefit plan, accumulated benefit obligation ₨ 829,500   833,900  
Employer contributions ₨ 145,300 $ 1.5 99,900  
Defined benefit plan minimum service period needed for annuity offer 15 years 15 years    
Pension | Centurion Bank of Punjab Limited        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, employer contribution as a percentage of basic salary 10.00% 10.00%    
Pension | Centurion Bank of Punjab Limited | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit pension plan, Service period of employees for whom contribution made stand frozen and will be converted into an annuity on separation 10 years 10 years    
Pension | Centurion Bank of Punjab Limited | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit pension plan, Service period of employees for whom contribution made stand frozen and will be converted into an annuity on separation 15 years 15 years    
Pension | Vested accumulated benefit obligation        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, accumulated benefit obligation ₨ 539,900   ₨ 545,700