Share-based payments (Details 3)	12 Months Ended
Mar. 31, 2021 yr $ / shares
Option Plan III Grant date May 5 2020 [Member]
Statement [Line Items]
Grant date	May 5, 2020
Category	Category III
Current market price \| $ / shares	$ 75.65
Exercise price \| $ / shares	$ 68.08
Dividend yield	12.00%
Discount rate	1.00%
Option Plan III Grant date Jan 28 2021 [Member]
Statement [Line Items]
Grant date	'Jan 28, 2021
Category	Category III
Current market price \| $ / shares	$ 169.52
Exercise price \| $ / shares	$ 152.56
Dividend yield	12.00%
Discount rate	1.00%
Bottom of range [member] \| Option Plan III Grant date May 5 2020 [Member]
Statement [Line Items]
Expected term \| yr	2
Volatility	52.08%
Bottom of range [member] \| Option Plan III Grant date Jan 28 2021 [Member]
Statement [Line Items]
Expected term \| yr	2
Volatility	66.40%
Top of range [member] \| Option Plan III Grant date May 5 2020 [Member]
Statement [Line Items]
Expected term \| yr	5
Volatility	90.94%
Top of range [member] \| Option Plan III Grant date Jan 28 2021 [Member]
Statement [Line Items]
Expected term \| yr	5
Volatility	135.87%

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

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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.

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The option life of share options granted.

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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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The market price per share option granted.

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