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Earnings per share (Details) - € / shares shares in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Earnings per share
Basic earnings per ordinary share (in euro per share)	€ 0.5824	€ 0.7739	€ 1.2151
Diluted earnings per ordinary share (in euro per share)	€ 0.5793	€ 0.7665	€ 1.2045
Number of ordinary shares (in Ms) used for EPS (weighted average)
Basic	1,113.8	1,143.6	1,193.5
Diluted (a)	1,119.8	1,154.6	1,204.0
Weighted average share options assumed to be converted	6.0	11.0	11.0

X

- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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