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Pension and Other Employee Obligations - Actuarial Assumptions For Gratuity Plans (Detail)	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Disclosure of defined benefit plans [line items]
Expected rate of return on plan assets	7.30%	7.05%	7.35%
Bottom of range [member]
Disclosure of defined benefit plans [line items]
Rate of increase in compensation level	7.00%	7.00%	6.00%
Top of range [member]
Disclosure of defined benefit plans [line items]
Rate of increase in compensation level	10.00%	15.00%	8.00%
India [member]
Disclosure of defined benefit plans [line items]
Discount rate		7.05%	7.35%
India [member] | Bottom of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	6.60%
India [member] | Top of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	7.30%
Philippines [member]
Disclosure of defined benefit plans [line items]
Discount rate	3.10%	5.45%	4.75%
Sri Lanka [member]
Disclosure of defined benefit plans [line items]
Discount rate	10.00%	12.80%	12.30%

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

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- Definition

The expected rate of return on plan assets used as a significant actuarial assumption to determine the present value of net defined benefit obligation.

+ References

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