Loans, Overdrafts and Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended				0 Months Ended	3 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	0 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended						9 Months Ended
	Nov. 01, 2014	Nov. 01, 2014	Feb. 01, 2014	Nov. 02, 2013	Nov. 01, 2014 Vehicles	May 15, 2014 Asset-backed securitization facility	Nov. 01, 2014 Asset-backed securitization facility	Nov. 01, 2014 Asset-backed securitization facility	May 15, 2014 Asset-backed securitization facility	Feb. 19, 2014 Bridge Facility	Nov. 01, 2014 Bridge Facility	Feb. 19, 2014 Bridge Facility	Nov. 01, 2014 4.700% senior unsecured notes due in 2024	Nov. 01, 2014 4.700% senior unsecured notes due in 2024	May 19, 2014 Signet UK Finance plc 4.700% senior unsecured notes due in 2024	May 19, 2014 Signet UK Finance plc 4.700% senior unsecured notes due in 2024	Nov. 01, 2014 Term loan	Nov. 01, 2014 Revolving Credit Facility	Nov. 01, 2014 Revolving Credit Facility	Feb. 01, 2014 Revolving Credit Facility	Nov. 02, 2013 Revolving Credit Facility	Nov. 01, 2014 Revolving Credit Facility Financial Standby Letter of Credit	Feb. 01, 2014 Revolving Credit Facility Financial Standby Letter of Credit	Nov. 02, 2013 Revolving Credit Facility Financial Standby Letter of Credit	Nov. 01, 2014 Letter of Credit	Nov. 01, 2014 Prior Credit Facility	Nov. 01, 2014 Amended and Restated Credit Agreement Maximum	Nov. 01, 2014 Amended and Restated Credit Agreement Minimum
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity												$ 800,000,000					$ 400,000,000	$ 400,000,000	$ 400,000,000
Debt instrument, maturity period						2 years				364 days							5 years								5 years
Term loan maturing in year one																	5.00%
Term loan maturing in year two																	7.50%
Term loan maturing in year three																	10.00%
Term loan maturing in year four																	12.50%
Term loan maturing in year five																	15.00%
Term loan maturity date																	May 27, 2019
Borrowings from the facility																		145,000,000	145,000,000	0	35,000,000	21,600,000	10,100,000	9,500,000		395,000,000
Leverage ratio																											250.00%
Fixed charge coverage ratio																												140.00%
Capitalized balance written-off																			900,000
Capitalized fees							2,800,000	2,800,000					7,000,000	7,000,000				6,700,000	6,700,000
Interest expense in the condensed consolidated income statement	(8,900,000)	(14,800,000)					400,000	600,000			4,000,000		200,000	300,000				300,000	600,000
Debt issuance costs incurred and capitalized											4,000,000
Debt instrument, principal amount																400,000,000
Debt instrument, interest rate																4.70%
Net proceeds from issuance of notes		398,400,000													393,900,000
Commercial paper									600,000,000
Bank overdraft	53,200,000	53,200,000	19,300,000	11,000,000
Assets under capital leases, net of accumulated depreciation					$ 1,400,000