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Pension and Other Employee Obligations - Actuarial Assumptions For Gratuity Plans (Detail)	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure of defined benefit plans [line items]
Expected rate of return on plan assets	7.00%	7.30%	7.05%
Bottom of range [member]
Disclosure of defined benefit plans [line items]
Rate of increase in compensation level	7.00%	7.00%	7.00%
Top of range [member]
Disclosure of defined benefit plans [line items]
Rate of increase in compensation level	8.00%	10.00%	15.00%
India [member]
Disclosure of defined benefit plans [line items]
Discount rate			7.05%
India [member] | Bottom of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	6.60%	6.60%
India [member] | Top of range [member]
Disclosure of defined benefit plans [line items]
Discount rate	7.00%	7.30%
Philippines [member]
Disclosure of defined benefit plans [line items]
Discount rate	6.10%	3.10%	5.45%
Sri Lanka [member]
Disclosure of defined benefit plans [line items]
Discount rate	11.00%	10.00%	12.80%

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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-IssueDate 2018-01-01
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X

- 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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-URIDate 2018-03-16

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ 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

No definition available.

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