Principal Accounting Policies And Basis Of Preparation (Policy)	3 Months Ended
	Apr. 28, 2012
Principal Accounting Policies And Basis Of Preparation [Abstract]
Basis Of Preparation	*Basis of preparation* Signet Jewelers Limited ("Signet" or the "Company"), including its subsidiaries, is a leading retailer of jewelry, watches and associated services. Signet manages its business as two geographical segments, the United States of America (the "US") and the United Kingdom (the "UK"). The US division operates retail stores under brands including Kay Jewelers, Jared The Galleria Of Jewelry and various regional brands, while the UK division's retail stores operate under brands including H.Samuel and Ernest Jones. These condensed consolidated financial statements included herein have been 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 accounting principles generally accepted in the United States of America ("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 year ended January 28, 2012.
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. Estimates and assumptions are primarily made in relation to the valuation of receivables, inventory and deferred revenue, fair value of derivatives, depreciation and asset impairment, the valuation of employee benefits, income taxes and contingencies.
Fiscal Year	*Fiscal year* The Company's fiscal year ends on the Saturday nearest to January 31^st. Fiscal 2012 is the year ended January 28, 2012 and Fiscal 2013 is the year ending February 2, 2013. Within these financial statements, the first quarter of the fiscal years 2013 and 2012 refers to the 13 weeks ended April 28, 2012 and April 30, 2011, respectively.

Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.

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- Definition

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

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