Employee benefits (Details 5)	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Actuarial assumptions [Abstract]
Discount rate	5.70%	5.60%	6.95%
Long-term rate of compensation increase	5.00%	5.00%	7.00%
Expected long term rate of return on plan assets			7.00%
Average future working life time (Years)	4 years 3 months 25 days	4 years 4 months 13 days	4 years 4 months 13 days
Not later than one year [Member]
Actuarial assumptions [Abstract]
Expected long term rate of return on plan assets	0.00%	0.00%
Less than 1 year [Member]
Actuarial assumptions [Abstract]
Expected long term rate of return on plan assets	5.00%	5.00%

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]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 144
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-URIDate 2020-01-01

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- Definition

The expected rate of increases in pension that is 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

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- Definition

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

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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 147
-Subparagraph c
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