Analysis Of Income And Expense [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
Analysis of income and expense [abstract]
Revenue [abstract]
Revenue	– GBP	1,047,800,000 GBP	—	—	1,047,800,000 GBP	—	—	—	—	—	—	– GBP	907,800,000 GBP	—	—	907,800,000 GBP	—	—	—	—
Material income and expense [abstract]
Impairment loss (reversal of impairment loss) on trade receivables [abstract]
Impairment loss (reversal of impairment loss) recognised in profit or loss, trade receivables	– GBP	9,700,000 GBP	—	—	9,700,000 GBP	—	—	—	—	—	—	– GBP	7,100,000 GBP	—	—	7,100,000 GBP	—	—	—	—
Finance income (cost)	– GBP	184,400,000 GBP	—	—	184,400,000 GBP	—	—	—	—	—	—	– GBP	150,200,000 GBP	—	—	150,200,000 GBP	—	—	—	—
Expenses by nature [abstract]
Raw materials and consumables used	200,000 GBP	51,700,000 GBP	—	—	51,900,000 GBP	—	—	—	—	—	—	– GBP	37,400,000 GBP	—	—	37,400,000 GBP	—	—	—	—
Classes of employee benefits expense [abstract]
Employee benefits expense	11,700,000 GBP	151,100,000 GBP	—	—	162,800,000 GBP	—	—	—	—	—	—	700,000 GBP	114,800,000 GBP	—	—	115,500,000 GBP	—	—	—	—
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Depreciation and amortisation expense [abstract]
Depreciation and amortisation expense	– GBP	187,100,000 GBP	—	—	187,100,000 GBP	—	—	—	—	—	—	– GBP	172,000,000 GBP	—	—	172,000,000 GBP	—	—	—	—
Disclosure of attribution of expenses by nature to their function [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of attribution of expenses by nature to their function [abstract]
Disclosure of attribution of expenses by nature to their function [line items]
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of associates and joint ventures accounted for using equity method	– GBP	800,000 GBP	—	—	800,000 GBP	—	—	—	—	—	—	– GBP	700,000 GBP	—	—	700,000 GBP	—	—	—	—
Income tax relating to components of other comprehensive income [abstract]
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss	—	—	900,000 GBP	– GBP	900,000 GBP	—	—	—	—	—	—	—	—	2,200,000 GBP	– GBP	2,200,000 GBP	—	—	—	—
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss	—	—	2,400,000 GBP	– GBP	2,400,000 GBP	—	—	—	—	—	—	—	—	4,100,000 GBP	– GBP	4,100,000 GBP	—	—	—	—
Comprehensive income, continuing and discontinued operations [abstract]
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 owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	57,200,000 GBP	—	—	—	—	—	—	—	—	—	—	27,300,000 GBP	—	—	—	—
Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract]
Comprehensive income, attributable to non-controlling interests	—	—	—	—	1,100,000 GBP	—	—	—	—	—	—	—	—	—	—	1,000,000 GBP	—	—	—	—