Loans, Overdrafts and Long-Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended			6 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended				3 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended		3 Months Ended	6 Months Ended		0 Months Ended	6 Months Ended
	Aug. 02, 2014	Aug. 02, 2014	Feb. 01, 2014	Aug. 03, 2013	Aug. 02, 2014 Vehicles	May 15, 2014 Asset-backed securitization facility	Aug. 02, 2014 Asset-backed securitization facility	Aug. 02, 2014 Asset-backed securitization facility	May 15, 2014 Asset-backed securitization facility	Feb. 01, 2014 Financial Standby Letter of Credit	Aug. 03, 2013 Financial Standby Letter of Credit	Aug. 02, 2014 4.700% senior unsecured notes due in 2024	Aug. 02, 2014 4.700% senior unsecured notes due in 2024	Feb. 19, 2014 Bridge Facility	Aug. 02, 2014 Bridge Facility	Aug. 02, 2014 Bridge Facility	Aug. 02, 2014 Capital lease obligations	Aug. 02, 2014 Capital lease obligations	Aug. 02, 2014 Signet UK Finance plc	Aug. 02, 2014 Signet UK Finance plc	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	Aug. 02, 2014 Revolving Credit Facility	Aug. 02, 2014 Revolving Credit Facility	Aug. 02, 2014 Letter of Credit	May 27, 2014 Term loan	Aug. 02, 2014 Term loan	May 27, 2014 Term loan	May 27, 2014 Amended and Restated Credit Agreement Maximum	May 27, 2014 Amended and Restated Credit Agreement Minimum	Aug. 02, 2014 Prior Credit Facility	Jun. 02, 2014 Amended Revolving Credit Facility	Aug. 02, 2014 Stand-by Letters of Credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity														$ 800									$ 400	$ 400
Debt instrument, maturity period						2 years								364 days											5 years	5 years
Borrowings from the facility			0	0						10.1	9.5																						20.3
Capitalized balance written-off																							0.7	0.9
Debt issuance costs incurred and capitalized																4.0
Interest expense in the condensed consolidated income statement	(5.9)	(5.9)					0.2	0.2				0.1	0.1		3.2	4.0	0.3	0.3
Debt instrument, principal amount																						400						400
Debt instrument, interest rate																						4.70%
Net proceeds from issuance of notes	398.4	398.4																			393.9
Capitalized fees							2.8	2.8				6.9	6.9				6.6	6.6
Payment of debt issuance costs	15.4	18.4						2.3					5.7					6.4	5.7	5.7
Debt issuance cost accrued							0.5	0.5				1.2	1.2				0.2	0.2
Commercial paper									600
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
Leverage ratio																													250.00%
Fixed charge coverage ratio																														140.00%
Borrowings on revolving credit facility																															400	0
Bank overdraft	10.1	10.1	19.3	1.7
Property and equipment, estimated useful life					4 years
Assets under capital leases, net of accumulated depreciation					$ 1.7