Analysis Of Income And Expense [Abstract]

Morgan Sindall Group PLC - Filing #2007817

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	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
Analysis of income and expense [abstract]
Revenue [abstract]
Revenue	—	4,117,700,000 GBP	—	—	—	—	—	3,612,200,000 GBP	—	—
Material income and expense [abstract]
Miscellaneous other operating income	—	1,600,000 GBP	—	—	—	—	—	500,000 GBP	—	—
Expenses by nature [abstract]
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Depreciation and amortisation expense [abstract]
Amortisation expense	—	2,900,000 GBP	—	—	—	—	—	2,000,000 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]
Miscellaneous other comprehensive income [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations	—	200,000 GBP	—	—	—	—	—	2,100,000 GBP	—	—
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	—	18,200,000 GBP	—	—	—	—	—	4,500,000 GBP	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	– GBP	117,900,000 GBP	117,700,000 GBP	– GBP	200,000 GBP	– GBP	2,100,000 GBP	63,000,000 GBP	– GBP	60,900,000 GBP
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	117,900,000 GBP	—	—	—	—	—	63,000,000 GBP	—	—