Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901

Name:	us-gaap_ForeignCurrencyExchangeRateTranslation1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Exchange rates (Details)	Mar. 31, 2022 R / $	Mar. 31, 2022 $ / R	Mar. 31, 2022 $ / £	Mar. 31, 2021 $ / R	Mar. 31, 2021 $ / £	Mar. 31, 2020 $ / R	Mar. 31, 2020 $ / £
Intercompany Foreign Currency Balance [Line Items]
Exchange rate	14.4916	14.49	0.76	14.92	0.73	17.92	0.81
Average
Intercompany Foreign Currency Balance [Line Items]
Exchange rate		14.86	0.73	16.37	0.77	14.78	0.79