Statement Of Comprehensive Income [Abstract]

Serco Group PLC - Filing #2006912

Concept	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31	2022-01-01 to 2022-12-31
Statement of comprehensive income [abstract]
Profit (loss)	—	202,400,000 GBP	173,300,000 GBP	—	—	—	—	29,100,000 GBP	—	—	—	—	155,000,000 GBP	—	—	—	13,700,000 GBP	168,700,000 GBP
Other comprehensive income [abstract]
Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract]
Exchange differences on translation [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations	—	38,400,000 GBP	—	—	—	—	—	—	—	—	—	—	60,200,000 GBP	—	—	—	—	—
Cash flow hedges [abstract]
Other comprehensive income, net of tax, cash flow hedges	—	800,000 GBP	—	—	—	—	—	—	—	—	—	—	600,000 GBP	—	—	—	—	—
Other comprehensive income	—	63,900,000 GBP	—	—	—	—	—	—	—	—	—	—	15,400,000 GBP	—	—	—	—	—
Comprehensive income	— GBP	138,500,000 GBP	—	100,000 GBP	203,400,000 GBP	— GBP	138,400,000 GBP	—	65,000,000 GBP	— GBP	139,800,000 GBP	18,300,000 GBP	139,600,000 GBP	— GBP	158,100,000 GBP	200,000 GBP	—	—
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	138,400,000 GBP	—	—	—	—	—	—	—	—	—	—	139,800,000 GBP	—	—	—	—	—
Comprehensive income, attributable to non-controlling interests	—	100,000 GBP	—	—	—	—	—	—	—	—	—	—	200,000 GBP	—	—	—	—	—