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Pension and Other Employee Obligations - Sensitivity of Defined Benefit Obligation to a Change in Each Significant Actuarial Assumption (Parenthetical) (Detail)
Mar. 31, 2018
Discount rate [member] | India [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumption 1.00%
Decrease in assumption 1.00%
Discount rate [member] | Philippines [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumption 1.00%
Decrease in assumption 1.00%
Discount rate [member] | Sri Lanka [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumption 1.00%
Decrease in assumption 1.00%
Salary escalation [member] | India [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumption 1.00%
Decrease in assumption 1.00%
Salary escalation [member] | Philippines [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumption 1.00%
Decrease in assumption 1.00%
Salary escalation [member] | Sri Lanka [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumption 1.00%
Decrease in assumption 1.00%