Profit Or Loss [Abstract]

Severn Trent PLC - Filing #1737775

Concept	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2021-04-01 to 2022-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31
Profit or loss [abstract]
Profit (loss) [abstract]
Revenue	—	—	– GBP	1,943,300,000 GBP	—	—	1,943,300,000 GBP	—	1,827,200,000 GBP	– GBP	—	—	—	1,827,200,000 GBP
Other income	—	—	– GBP	5,300,000 GBP	—	—	5,300,000 GBP	—	– GBP	– GBP	—	—	—	– GBP
Profit (loss) from operating activities	—	—	2,100,000 GBP	508,300,000 GBP	—	—	506,200,000 GBP	—	472,800,000 GBP	2,100,000 GBP	—	—	—	470,700,000 GBP
Finance income	—	—	– GBP	54,700,000 GBP	—	—	54,700,000 GBP	—	59,800,000 GBP	– GBP	—	—	—	59,800,000 GBP
Finance costs	—	—	– GBP	324,100,000 GBP	—	—	324,100,000 GBP	—	246,900,000 GBP	– GBP	—	—	—	246,900,000 GBP
Profit (loss) before tax	—	—	2,100,000 GBP	276,200,000 GBP	—	—	274,100,000 GBP	—	274,200,000 GBP	7,000,000 GBP	—	—	—	267,200,000 GBP
Tax expense (income)	—	—	294,400,000 GBP	66,900,000 GBP	—	—	361,300,000 GBP	—	55,000,000 GBP	– GBP	—	—	—	55,000,000 GBP
Profit (loss)	– GBP	87,200,000 GBP	296,500,000 GBP	209,300,000 GBP	– GBP	– GBP	87,200,000 GBP	– GBP	219,200,000 GBP	7,000,000 GBP	– GBP	– GBP	212,200,000 GBP	212,200,000 GBP
Earnings per share [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Earnings per share [abstract]
Earnings per share [line items]
Basic earnings per share [abstract]
Basic earnings (loss) per share	—	—	—	—	—	—	0.352	—	—	—	—	—	—	0.891
Diluted earnings per share [abstract]
Diluted earnings (loss) per share	—	—	—	—	—	—	0.352	—	—	—	—	—	—	0.886