Condensed Consolidating Financial Information - Condensed Consolidated Income Statement (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Condensed Income Statements, Captions [Line Items]
Sales	$ 6,550.2	$ 5,736.3	$ 4,209.2
Cost of sales	(4,109.8)	(3,662.1)	(2,628.7)
Gross margin	2,440.4	2,074.2	1,580.5
Selling, general and administrative expenses	(1,987.6)	(1,712.9)	(1,196.7)
Other operating income, net	250.9	215.3	186.7
Operating income	703.7	576.6	570.5
Intra-entity interest income (expense)	0.0	0.0
Interest expense, net	(45.9)	(36.0)	(4.0)
Income before income taxes	657.8	540.6	566.5
Income taxes	(189.9)	(159.3)	(198.5)
Equity in income of subsidiaries	0.0	0.0
Net income (loss)	467.9	381.3	368.0
Consolidation, Eliminations
Condensed Income Statements, Captions [Line Items]
Sales	0.0	0.0	0.0
Cost of sales	0.0	0.0	0.0
Gross margin	0.0	0.0	0.0
Selling, general and administrative expenses	0.0	0.0	0.0
Other operating income, net	0.0	0.0	0.0
Operating income	0.0	0.0	0.0
Intra-entity interest income (expense)	0.0	0.0	0.0
Interest expense, net	0.0	0.0	0.0
Income before income taxes	0.0	0.0	0.0
Income taxes	0.0	0.0	0.0
Equity in income of subsidiaries	(1,045.4)	(1,529.0)	(1,016.4)
Net income (loss)	(1,045.4)	(1,529.0)	(1,016.4)
Signet Jewelers Limited | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Sales	0.0	0.0	0.0
Cost of sales	0.0	0.0	0.0
Gross margin	0.0	0.0	0.0
Selling, general and administrative expenses	(2.2)	(2.5)	(2.9)
Other operating income, net	0.0	0.0	0.0
Operating income	(2.2)	(2.5)	(2.9)
Intra-entity interest income (expense)	0.0	0.0	0.0
Interest expense, net	0.0	0.0	0.0
Income before income taxes	(2.2)	(2.5)	(2.9)
Income taxes	0.0	0.0	0.0
Equity in income of subsidiaries	470.1	383.8	370.9
Net income (loss)	467.9	381.3	368.0
Signet UK Finance plc | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Sales	0.0	0.0	0.0
Cost of sales	0.0	0.0	0.0
Gross margin	0.0	0.0	0.0
Selling, general and administrative expenses	0.0	0.0	0.0
Other operating income, net	0.0	0.0	0.0
Operating income	0.0	0.0	0.0
Intra-entity interest income (expense)	18.8	13.2	0.0
Interest expense, net	(19.9)	(13.9)	0.0
Income before income taxes	(1.1)	(0.7)	0.0
Income taxes	0.2	0.1	0.0
Equity in income of subsidiaries	0.0	0.0	0.0
Net income (loss)	(0.9)	(0.6)	0.0
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Sales	6,444.8	5,671.4	4,162.9
Cost of sales	(4,089.3)	(3,647.0)	(2,621.2)
Gross margin	2,355.5	2,024.4	1,541.7
Selling, general and administrative expenses	(1,942.7)	(1,683.6)	(1,193.1)
Other operating income, net	254.8	220.8	183.8
Operating income	667.6	561.6	532.4
Intra-entity interest income (expense)	(186.0)	(129.6)	(34.5)
Interest expense, net	(14.8)	(14.8)	(3.9)
Income before income taxes	466.8	417.2	494.0
Income taxes	(192.7)	(159.5)	(196.8)
Equity in income of subsidiaries	281.4	579.8	344.2
Net income (loss)	555.5	837.5	641.4
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Income Statements, Captions [Line Items]
Sales	105.4	64.9	46.3
Cost of sales	(20.5)	(15.1)	(7.5)
Gross margin	84.9	49.8	38.8
Selling, general and administrative expenses	(42.7)	(26.8)	(0.7)
Other operating income, net	(3.9)	(5.5)	2.9
Operating income	38.3	17.5	41.0
Intra-entity interest income (expense)	167.2	116.4	34.5
Interest expense, net	(11.2)	(7.3)	(0.1)
Income before income taxes	194.3	126.6	75.4
Income taxes	2.6	0.1	(1.7)
Equity in income of subsidiaries	293.9	565.4	301.3
Net income (loss)	$ 490.8	$ 692.1	$ 375.0