Consolidated statement of changes in equity (parenthetical)	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Consolidated statement of changes in equity
Equity interest in subsidiary (as a percent)	98.56%	98.53%	98.22%	98.20%

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

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