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Pension and Other Employee Obligations - Sensitivity of Defined Benefit Obligation to a Change in Each Significant Actuarial Assumption (Detail)
Mar. 31, 2019
India [member] | Discount rate [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Sensitivity of defined benefit obligation due to a possible increase in assumption (4.70%)
Sensitivity of defined benefit obligation due to a possible decrease in assumption 5.20%
India [member] | Salary escalation [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Sensitivity of defined benefit obligation due to a possible increase in assumption 4.10%
Sensitivity of defined benefit obligation due to a possible decrease in assumption (3.90%)
Philippines [member] | Discount rate [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Sensitivity of defined benefit obligation due to a possible increase in assumption (0.90%)
Sensitivity of defined benefit obligation due to a possible decrease in assumption 1.00%
Philippines [member] | Salary escalation [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Sensitivity of defined benefit obligation due to a possible increase in assumption 0.50%
Sensitivity of defined benefit obligation due to a possible decrease in assumption (0.50%)
Sri Lanka [member] | Discount rate [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Sensitivity of defined benefit obligation due to a possible increase in assumption (4.20%)
Sensitivity of defined benefit obligation due to a possible decrease in assumption 4.60%
Sri Lanka [member] | Salary escalation [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Sensitivity of defined benefit obligation due to a possible increase in assumption 4.20%
Sensitivity of defined benefit obligation due to a possible decrease in assumption (3.90%)