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Employee Benefits - Additional Information (Detail) - INR (₨) ₨ in Millions	Mar. 31, 2020	Mar. 31, 2019
Actuarial assumption of discount rates [member]
Disclosure of defined benefit plans [line items]
Percentage of reasonably possible increase in actuarial assumption	0.50%
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible increase in actuarial assumption	₨ (626)	₨ (405)
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible decrease in actuarial assumption	₨ 584	435
Actuarial assumption of expected rates of salary increases [member]
Disclosure of defined benefit plans [line items]
Percentage of reasonably possible decrease in actuarial assumption	0.50%
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible increase in actuarial assumption	₨ 353	245
Increase/ (decrease) in gratuity benefit obligation due to reasonably possible decrease in actuarial assumption	₨ (329)	₨ (229)

X

- Definition

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

No definition available.

+ Details

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2019-01-01
-Paragraph 145
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X

- Definition

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-Paragraph 145
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- Definition

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]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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