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Retirement Benefits - Additional Information (Detail) - INR (₨)
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Superannuation      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary 13.00%    
Defined contribution plan, employer contribution recognized as an expense ₨ 536,800,000 ₨ 432,200,000 ₨ 373,300,000
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%    
Provident Fund      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary 12.00%    
Defined contribution plan, employer contribution recognized as an expense ₨ 1,600,200,000 1,433,400,000 ₨ 1,295,400,000
Provident Fund Administered by Regional Provident Fund Commissioner      
Defined Benefit Plan Disclosure [Line Items]      
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%    
Provident Fund Administered by Regional Provident Fund Commissioner | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan -contribution to Pension Scheme administered by Regional Provident Fund Commissioner, amount considered - lower of the percentage of employees eligible salary or fixed amount ₨ 6,500    
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    
Defined benefit plan, vesting period 5 years    
Defined benefit plan, expected contribution to the plan for the next fiscal year ₨ 616,400,000    
Defined benefit plan, accumulated benefit obligation 1,680,600,000 1,535,700,000  
Gratuity | Vested accumulated benefit obligation      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation 1,137,800,000 1,017,300,000  
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, expected contribution to the plan for the next fiscal year 157,000,000    
Defined benefit plan, accumulated benefit obligation ₨ 339,600,000 375,800,000  
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%    
Lock-in-period after which contribution made for employees stand frozen and will be converted into an annuity on separation 2 years    
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    
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    
Pension | Vested accumulated benefit obligation      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, accumulated benefit obligation ₨ 223,300,000 ₨ 264,000,000