Profit Or Loss [Abstract]

HEADLAM GROUP PLC - Filing #1587527

Concept	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31
Profit or loss [abstract]
Profit (loss) [abstract]
Revenue	—	667,200,000 GBP	– GBP	—	—	—	—	—	667,200,000 GBP	—	578,100,000 GBP	—	—	578,100,000 GBP	– GBP	—	—	—	—	—
Profit (loss) from operating activities	—	37,300,000 GBP	8,200,000 GBP	—	—	—	—	—	29,100,000 GBP	—	12,200,000 GBP	—	—	17,400,000 GBP	29,600,000 GBP	—	—	—	—	—
Finance income	—	400,000 GBP	– GBP	—	—	—	—	—	400,000 GBP	—	800,000 GBP	—	—	800,000 GBP	– GBP	—	—	—	—	—
Finance costs	—	1,900,000 GBP	– GBP	—	—	—	—	—	1,900,000 GBP	—	2,900,000 GBP	—	—	2,800,000 GBP	100,000 GBP	—	—	—	—	—
Profit (loss) before tax	—	35,800,000 GBP	8,200,000 GBP	—	—	—	—	—	27,600,000 GBP	—	14,300,000 GBP	—	—	15,400,000 GBP	29,700,000 GBP	—	—	—	—	—
Tax expense (income)	—	9,200,000 GBP	1,500,000 GBP	—	—	—	—	—	7,700,000 GBP	—	3,100,000 GBP	—	—	3,800,000 GBP	700,000 GBP	—	—	—	—	—
Profit (loss) from continuing operations	—	26,600,000 GBP	6,700,000 GBP	—	—	—	—	—	19,900,000 GBP	—	17,400,000 GBP	—	—	11,600,000 GBP	29,000,000 GBP	—	—	—	—	—
Profit (loss) from discontinued operations	—	100,000 GBP	4,400,000 GBP	—	—	—	—	—	4,500,000 GBP	—	2,900,000 GBP	—	—	400,000 GBP	3,300,000 GBP	—	—	—	—	—
Profit (loss), attributable to [abstract]
Profit (loss), attributable to owners of parent	– GBP	26,700,000 GBP	2,300,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	24,400,000 GBP	24,400,000 GBP	20,300,000 GBP	– GBP	– GBP	12,000,000 GBP	32,300,000 GBP	20,300,000 GBP	– GBP	– GBP	– GBP	– 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 from continuing operations	—	0.315	—	—	—	—	—	—	0.235	—	0.207	—	—	0.137	—	—	—	—	—	—
Basic earnings (loss) per share from discontinued operations	—	0.002	—	—	—	—	—	—	0.053	—	0.034	—	—	0.005	—	—	—	—	—	—
Diluted earnings per share [abstract]
Diluted earnings (loss) per share from continuing operations	—	0.311	—	—	—	—	—	—	0.232	—	0.207	—	—	0.137	—	—	—	—	—	—
Diluted earnings (loss) per share from discontinued operations	—	0.002	—	—	—	—	—	—	0.052	—	0.034	—	—	0.005	—	—	—	—	—	—