Statement Of Comprehensive Income [Abstract]

Pennon Group PLC - Filing #6458173

Concept	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	2024-04-01 to 2025-03-31	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	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
Statement of comprehensive income [abstract]
Profit (loss)	28,700,000 GBP	28,100,000 GBP	28,100,000 GBP	28,700,000 GBP	56,800,000 GBP	1,100,000 GBP	– GBP	– GBP	– GBP	57,900,000 GBP	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
Other comprehensive income [abstract]
Other comprehensive income that will not be reclassified to profit or loss, net of tax	—	—	2,600,000 GBP	– GBP	2,600,000 GBP	—	—	—	—	—	—	—	—	5,500,000 GBP	– GBP	5  .  5 GBP	—	—	—	—
Other comprehensive income that will be reclassified to profit or loss, net of tax	—	—	1,900,000 GBP	– GBP	1,900,000 GBP	—	—	—	—	—	—	—	—	12,300,000 GBP	– GBP	12,300,000 GBP	—	—	—	—
Other comprehensive income	—	—	700,000 GBP	– GBP	700,000 GBP	– GBP	– GBP	– GBP	– GBP	700,000 GBP	17,800,000 GBP	—	—	17,800,000 GBP	– GBP	17,800,000 GBP	– GBP	– GBP	– GBP	– GBP
Comprehensive income	—	—	27,400,000 GBP	28,700,000 GBP	56,100,000 GBP	1,100,000 GBP	– GBP	– GBP	– GBP	57,200,000 GBP	27,300,000 GBP	—	—	5,300,000 GBP	21,000,000 GBP	26,300,000 GBP	– GBP	– GBP	– GBP	1,000,000 GBP
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	57,200,000 GBP	—	—	—	—	—	—	—	—	—	—	27,300,000 GBP	—	—	—	—
Comprehensive income, attributable to non-controlling interests	—	—	—	—	1,100,000 GBP	—	—	—	—	—	—	—	—	—	—	1,000,000 GBP	—	—	—	—