XML 22 R161.htm IDEA: XBRL DOCUMENT v3.20.1
Employee Benefits - Summary of Principal Assumptions Used for Purpose of Actuarial Valuation of Defined Benefit Plans (Detail)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of actuarial assumptions [line items]    
Discount rate 5.05% 6.05%
Expected return on plan assets 5.05% 6.05%
Expected rate of salary increase 6.60% 6.80%
Duration of defined benefit obligations 9 years 8 years
Provident fund [member]    
Disclosure of actuarial assumptions [line items]    
Discount rate 6.05% 7.00%
Average remaining tenure of investment portfolio 7 years 8 years
Guaranteed rate of return 8.50% 8.65%