The interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The average hedged rate per ton.

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Financial instruments - Fair values and risk management - Notional principal amounts (Details) € in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021 USD ($) $ / € $ / t	Mar. 31, 2020 USD ($) $ / t	Mar. 31, 2019 USD ($) $ / t	Mar. 31, 2021 EUR (€) $ / €	Mar. 31, 2020 EUR (€)	Mar. 31, 2019 EUR (€)
Disclosure of detailed information about financial instruments [line items]
Interest rate percentage	(0.26%)	0.73%	0.01%	(0.26%)	0.73%	0.01%
Closing foreign exchange rate \| $ / €	1.1725			1.1725
Fixed rate
Disclosure of detailed information about financial instruments [line items]
Interest rate percentage	1.40%	1.42%	1.48%	1.40%	1.42%	1.48%
Cash Flow Hedges
Disclosure of detailed information about financial instruments [line items]
Closing foreign exchange rate \| $ / €	1.2099			1.2099
Foreign currency forward contracts \| Cash Flow Hedges
Disclosure of detailed information about financial instruments [line items]
Notional amount				€ 3,069.3	€ 7,746.6	€ 8,672.0
Forward foreign exchange contracts - Within 1 Year \| Cash Flow Hedges
Disclosure of detailed information about financial instruments [line items]
Notional amount				1,506.9	3,670.9	4,007.0
Forward foreign exchange contracts - Greater than 1 Year \| Cash Flow Hedges
Disclosure of detailed information about financial instruments [line items]
Notional amount				€ 1,562.4	4,075.7	4,665.0
Currency swap contract \| Maximum
Disclosure of detailed information about financial instruments [line items]
Interest rate percentage	1.79%			1.79%
Currency swap contract \| Minimum
Disclosure of detailed information about financial instruments [line items]
Interest rate percentage	1.54%			1.54%
Currency swap contract \| Fixed rate
Disclosure of detailed information about financial instruments [line items]
Notional amount	$ 65	$ 82	$ 98	€ 52.0	65.0	78.0
Jet fuel Forward Contracts [Member] \| Cash Flow Hedges
Disclosure of detailed information about financial instruments [line items]
Notional amount				€ 609.0	€ 2,829.0	€ 2,482.0
Average hedged rate per ton \| $ / t	545	588	705