Statement Of Changes In Equity [Abstract]

Pennon Group PLC - Filing #2044939

Concept	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	2023-04-01 to 2024-03-31	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	2023-04-01 to 2024-03-31	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	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	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	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	As at 2022-03-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Equity	431,300,000 GBP	—	—	—	—	—	1,400,000 GBP	398,200,000 GBP	174,600,000 GBP	157,100,000 GBP	—	1,162,600,000 GBP	—	—	—	—	—	570,600,000 GBP	—	—	—	—	—	1,125,200,000 GBP	237,600,000 GBP	159,500,000 GBP	157,100,000 GBP	—	—	—	400,000 GBP	—	154,700,000 GBP	722,600,000 GBP	161,700,000 GBP	235,500,000 GBP	100,000 GBP	1,274,600,000 GBP
Changes in equity [abstract]
Comprehensive income [abstract]
Profit (loss)	—	9,500,000 GBP	21,000,000 GBP	12,500,000 GBP	12,500,000 GBP	21,000,000 GBP	—	—	—	—	8,500,000 GBP	—	– GBP	– GBP	– GBP	1,000,000 GBP	– GBP	—	100,000 GBP	20,000,000 GBP	20,400,000 GBP	20,400,000 GBP	20,000,000 GBP	—	—	—	—	– GBP	– GBP	300,000 GBP	—	400,000 GBP	—	—	—	—	—	—
Other comprehensive income	—	17,800,000 GBP	—	—	17,800,000 GBP	– GBP	—	—	—	—	17,800,000 GBP	—	– GBP	– GBP	– GBP	– GBP	– GBP	—	7,400,000 GBP	—	—	7,400,000 GBP	– GBP	—	—	—	—	– GBP	– GBP	– GBP	—	7,400,000 GBP	—	—	—	—	—	—
Comprehensive income	—	27,300,000 GBP	—	—	5. 3 GBP	21,000,000 GBP	—	—	—	—	26,300,000 GBP	—	– GBP	– GBP	– GBP	1,000,000 GBP	– GBP	—	7,300,000 GBP	—	—	13,000,000 GBP	20,000,000 GBP	—	—	—	—	– GBP	– GBP	300,000 GBP	—	7,000,000 GBP	—	—	—	—	—	—
Issue of equity	—	– GBP	—	—	—	—	—	—	—	—	400,000 GBP	—	400,000 GBP	– GBP	– GBP	– GBP	– GBP	—	– GBP	—	—	—	—	—	—	—	—	200,000 GBP	2,100,000 GBP	– GBP	—	2,300,000 GBP	—	—	—	—	—	—
Dividends recognised as distributions to owners	—	111,700,000 GBP	—	—	—	—	—	—	—	—	111,700,000 GBP	—	– GBP	– GBP	– GBP	– GBP	– GBP	—	101,600,000 GBP	—	—	—	—	—	—	—	—	– GBP	– GBP	– GBP	—	101,600,000 GBP	—	—	—	—	—	—
Increase (decrease) through share-based payment transactions, equity	—	1,100,000 GBP	—	—	—	—	—	—	—	—	1,100,000 GBP	—	– GBP	– GBP	– GBP	– GBP	– GBP	—	1,900,000 GBP	—	—	—	—	—	—	—	—	– GBP	– GBP	– GBP	—	1,900,000 GBP	—	—	—	—	—	—