Organization and principal accounting policies (Policies)	9 Months Ended
	Oct. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of preparation	Basis of preparation The condensed consolidated financial statements of Signet are prepared, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with US generally accepted accounting principles (“US GAAP”) have been condensed or omitted from this report, as is permitted by such rules and regulations. In the opinion of management, the accompanying condensed consolidated financial statements reflect all adjustments, which are of a normal recurring nature, necessary for a fair presentation of the results for the interim periods. It is suggested that these condensed consolidated financial statements be read in conjunction with the consolidated financial statements and notes included in Signet’s Annual Report on Form 10-K for the fiscal year ended January 30, 2021 filed with the SEC on March 19, 2021.
Use of estimates	Use of estimates The preparation of these condensed consolidated financial statements, in conformity with US GAAP and SEC regulations for interim reporting, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates, and as a result of the above noted risks associated with COVID-19, it is reasonably possible that those estimates will change in the near term and the effect could be material. Estimates and assumptions are primarily made in relation to the valuation of inventories, deferred revenue, derivatives, employee benefits, income taxes, contingencies, leases, asset impairments for goodwill, indefinite-lived intangible and long-lived assets and the depreciation and amortization of long-lived assets.
Fiscal year	Fiscal year The Company’s fiscal year ends on the Saturday nearest to January 31st. Fiscal 2022 and Fiscal 2021 refer to the 52 week periods ending January 29, 2022 and ended January 30, 2021, respectively. Within these condensed consolidated financial statements, the third quarter of the relevant fiscal years 2022 and 2021 refer to the 13 weeks ended October 30, 2021 and October 31, 2020, respectively.
Foreign currency translation	Foreign currency translation The financial position and operating results of certain foreign operations, including certain subsidiaries operating in the UK as part of the International segment and Canada as part of the North America segment, are consolidated using the local currency as the functional currency. Assets and liabilities are translated at the rates of exchange on the balance sheet date, and revenues and expenses are translated at the monthly average rates of exchange during the period. Resulting translation gains or losses are included in the accompanying condensed consolidated statements of shareholders’ equity as a component of accumulated other comprehensive income (loss) (“AOCI”). Gains or losses resulting from foreign currency transactions are included in other operating income, net within the condensed consolidated statements of operations.
New accounting pronouncements	New accounting pronouncements recently adopted There were no new accounting pronouncements adopted during Fiscal 2022 that have a material impact on the Company’s financial position or results of operations. New accounting pronouncements issued but not yet adopted In October 2021, the FASB issued ASU 2021-08, Business Combinations (“Topic 805”): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. This ASU requires that an acquirer recognize and measure customer contract assets and liabilities in a business combination in accordance with Topic 606, Revenue from Contracts with Customers, as if the acquirer had originated the contracts, rather than under Topic 805. Under prior guidance with Topic 805, a liability for deferred revenue was generally recognized in an acquirer’s financial statements as if it represented a legal obligation. This ASU is effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the impact of this ASU on its consolidated financial statements.