Share-based payments (Details 3)	12 Months Ended
Mar. 31, 2022 yr $ / shares	Mar. 31, 2021
Option Plan Iii Grant Date May 7 2021 [Member]
Statement [Line Items]
Grant date	May 7, 2021
Category	Category III
Current market price \| $ / shares	$ 208.7
Exercise price \| $ / shares	$ 187.83
Dividend yield	12.00%
Discount rate	1.00%
Option Plan Iii Grant Date Oct 28 2021 [Member]
Statement [Line Items]
Grant date	Oct 28, 2021
Category	Category III
Current market price \| $ / shares	$ 256.64
Exercise price \| $ / shares	$ 230.97
Dividend yield		12.00%
Discount rate	1.00%
Bottom of range [member] \| Option Plan Iii Grant Date May 7 2021 [Member]
Statement [Line Items]
Expected term \| yr	2
Volatility	75.63%
Bottom of range [member] \| Option Plan Iii Grant Date Oct 28 2021 [Member]
Statement [Line Items]
Expected term \| yr	2
Volatility	57.76%
Top of range [member] \| Option Plan Iii Grant Date May 7 2021 [Member]
Statement [Line Items]
Expected term \| yr	5
Volatility	157.41%
Top of range [member] \| Option Plan Iii Grant Date Oct 28 2021 [Member]
Statement [Line Items]
Expected term \| yr	5
Volatility	115.02%

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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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Statement [Line Items]

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