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Significant accounting policies - Other liabilities (Details) - item	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant accounting policies
Number of month's salary required for the payment of single lump sum	1
Period of service calculated to pay benefits	5 years
Period for payment of legal fee	12 months
Minimum
Significant accounting policies
Discount rate	4.60%	4.80%	6.50%
Projected increase rate in compensation	8.00%	8.00%	12.00%
Maximum
Significant accounting policies
Discount rate	9.20%	6.20%	8.50%
Projected increase rate in compensation	16.30%	22.50%	26.80%

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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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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- 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.

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- Definition

Number of month's salary to be considered for the payment of benefits.

+ References

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- Definition

The period during which the legal fee is to be paid in consecutive installments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Period of service calculated to pay benefits, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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