Statement Of Changes In Equity [Abstract]

Safestore Holdings PLC - Filing #1845179

Concept	2021-11-01 to 2022-10-31	2021-11-01 to 2022-10-31	2021-11-01 to 2022-10-31	2021-11-01 to 2022-10-31	2021-11-01 to 2022-10-31	2020-11-01 to 2021-10-31	2020-11-01 to 2021-10-31	2020-11-01 to 2021-10-31	2020-11-01 to 2021-10-31	2020-11-01 to 2021-10-31
Statement of changes in equity [abstract]
Statement of changes in equity [line items]
Increase (decrease) through exercise of options, equity	— GBP	8,600,000 GBP	— GBP	8,600,000 GBP	— GBP	— GBP	— GBP	— GBP	8,600,000 GBP	8,600,000 GBP
Increase (decrease) through transactions with owners, equity	— GBP	47,800,000 GBP	500,000 GBP	48,300,000 GBP	— GBP	700,000 GBP	— GBP	— GBP	33,300,000 GBP	34,000,000 GBP