Profit Or Loss [Abstract]

Serco Group PLC - Filing #2006913

Concept	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
Profit or loss [abstract]
Profit (loss) [abstract]
Revenue	4,873,800,000 GBP	— GBP	4,873,800,000 GBP	4,534,000,000 GBP	— GBP	4,534,000,000 GBP
Cost of sales	4,378,300,000 GBP	— GBP	4,378,300,000 GBP	4,040,500,000 GBP	4,200,000 GBP	4,044,700,000 GBP
Gross profit	495,500,000 GBP	— GBP	495,500,000 GBP	493,500,000 GBP	4,200,000 GBP	489,300,000 GBP
Administrative expenses	275,800,000 GBP	— GBP	275,800,000 GBP	264,300,000 GBP	— GBP	264,300,000 GBP
Profit (loss) from operating activities	271,600,000 GBP	22,900,000 GBP	248,700,000 GBP	217,200,000 GBP	19,800,000 GBP	237,000,000 GBP
Finance costs	31,600,000 GBP	— GBP	31,600,000 GBP	25,100,000 GBP	— GBP	25,100,000 GBP
Share of profit (loss) of associates and joint ventures accounted for using equity method	29,000,000 GBP	— GBP	29,000,000 GBP	12,000,000 GBP	— GBP	12,000,000 GBP
Profit (loss) before tax	247,000,000 GBP	22,900,000 GBP	224,100,000 GBP	196,800,000 GBP	19,800,000 GBP	216,600,000 GBP
Tax expense (income)	44,600,000 GBP	6,200,000 GBP	50,800,000 GBP	41,800,000 GBP	6,100,000 GBP	47,900,000 GBP
Profit (loss)	202,400,000 GBP	29,100,000 GBP	173,300,000 GBP	155,000,000 GBP	13,700,000 GBP	168,700,000 GBP
Profit (loss), attributable to [abstract]
Profit (loss), attributable to owners of parent	202,400,000 GBP	29,100,000 GBP	173,300,000 GBP	155,400,000 GBP	13,700,000 GBP	169,100,000 GBP
Profit (loss), attributable to non-controlling interests	— GBP	— GBP	— GBP	400,000 GBP	— GBP	400,000 GBP
Earnings per share [text block]	—	—	—	—	—	—
Earnings per share [abstract]
Earnings per share [line items]
Basic earnings per share [abstract]
Basic earnings (loss) per share	0.1823	—	0.1561	0.1303	—	0.1418
Diluted earnings per share [abstract]
Diluted earnings (loss) per share	0.1793	—	0.1536	0.1279	—	0.1392