Share-based payments (Details 2) - Option plan III Grant date 18Jan2018 [Member]	12 Months Ended
Mar. 31, 2018 ₨ / shares
Grant date	Jan 18, 2018
Category	Category III
Current market price	₨ 162.51
Exercise price	₨ 146.23
Assumptions
Dividend yield	12.00%
Discount rate	3.00%
Bottom of range [member]
Expected term	2
Volatility	53.15%
Top of range [member]
Expected term	5
Volatility	97.76%

The date on which share-based payment arrangements are granted. [Refer: Share-based payment arrangements [member]]

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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

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The option life of share options granted.

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- Definition

The description of the option pricing model used for share options granted. [Refer: Option pricing model [member]]

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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The exercise price share option granted.

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- Definition

The market price per share option granted.

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