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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, 2018
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 (7.30%)
Sensitivity of defined benefit obligation due to a possible decrease in assumption 0.70%
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 3.60%
Sensitivity of defined benefit obligation due to a possible decrease in assumption (3.50%)
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 (1.40%)
Sensitivity of defined benefit obligation due to a possible decrease in assumption 1.50%
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 1.00%
Sensitivity of defined benefit obligation due to a possible decrease in assumption (0.90%)
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 (3.40%)
Sensitivity of defined benefit obligation due to a possible decrease in assumption 0.50%
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 1.50%
Sensitivity of defined benefit obligation due to a possible decrease in assumption (1.50%)