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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%

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The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

+ References

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The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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