Statement Of Changes In Equity [Abstract]

Severn Trent PLC - Filing #2059764

Concept	2023-04-01 to 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	As at 2024-03-31	2023-04-01 to 2024-03-31	As at 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	As at 2023-03-31	As at 2023-03-31	As at 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	As at 2023-03-31	2022-04-01 to 2023-03-31	2022-04-01 to 2023-03-31	As at 2023-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31	As at 2022-03-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	—	167,600,000 GBP	7,900,000 GBP	1,363,100,000 GBP	295,400,000 GBP	—	1,834,000,000 GBP	—	—	—	970,600,000 GBP	408,700,000 GBP	249,100,000 GBP	—	—	—	162,500,000 GBP	—	—	150,300,000 GBP	148,400,000 GBP	473,000,000 GBP	394,400,000 GBP	248,100,000 GBP	1,263,900,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	– GBP	—	—	—	—	140,200,000 GBP	—	– GBP	– GBP	140,200,000 GBP	—	—	—	– GBP	132,200,000 GBP	– GBP	—	– GBP	132,200,000 GBP	—	—	—	—	—	—
Other comprehensive income	—	—	—	—	—	21,200,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	187,300,000 GBP	—	—	—	—	—	—
Comprehensive income	9,000,000 GBP	—	—	—	—	161,400,000 GBP	—	– GBP	– GBP	152,400,000 GBP	—	—	—	– GBP	57,000,000 GBP	– GBP	—	1,900,000 GBP	55,100,000 GBP	—	—	—	—	—	—
Dividends recognised as distributions to owners	– GBP	—	—	—	—	301,400,000 GBP	—	– GBP	– GBP	301,400,000 GBP	—	—	—	– GBP	261,300,000 GBP	– GBP	—	– GBP	261,300,000 GBP	—	—	—	—	—	—