Condensed Consolidated Income Statement (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014	Aug. 03, 2013
Condensed Financial Statements, Captions [Line Items]
Sales	$ 1,225.9	$ 880.2	$ 2,282.0	$ 1,873.8
Cost of sales	(816.9)	(570.5)	(1,465.8)	(1,181.3)
Gross margin	409.0	309.7	816.2	692.5
Selling, general and administrative expenses	(379.2)	(250.5)	(689.7)	(537.5)
Other operating income, net	53.7	46.3	107.7	93.3
Operating (loss) income	83.5	105.5	234.2	248.3
Interest expense, net	(13.7)	(1.0)	(15.5)	(1.9)
(Loss) income before income taxes	69.8	104.5	218.7	246.4
Income taxes	(11.8)	(37.1)	(64.1)	(87.2)
Net income	58.0	67.4	154.6	159.2
Eliminations
Condensed Financial Statements, Captions [Line Items]
Equity in income of subsidiaries	(116.1)	(182.0)	(385.1)	(433.9)
Net income	(116.1)	(182.0)	(385.1)	(433.9)
Signet Jewelers Limited
Condensed Financial Statements, Captions [Line Items]
Selling, general and administrative expenses	(0.4)	(0.7)	(0.8)	(1.1)
Operating (loss) income	(0.4)	(0.7)	(0.8)	(1.1)
(Loss) income before income taxes	(0.4)	(0.7)	(0.8)	(1.1)
Equity in income of subsidiaries	58.4	68.1	155.4	160.3
Net income	58.0	67.4	154.6	159.2
Signet UK Finance plc
Condensed Financial Statements, Captions [Line Items]
Intercompany interest income (expense)	3.8		3.8
Interest expense, net	(3.9)		(3.9)
(Loss) income before income taxes	(0.1)		(0.1)
Net income	(0.1)		(0.1)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Sales	1,207.5	870.3	2,251.2	1,852.0
Cost of sales	(811.4)	(570.2)	(1,459.0)	(1,179.5)
Gross margin	396.1	300.1	792.2	672.5
Selling, general and administrative expenses	(371.9)	(250.6)	(675.7)	(536.2)
Other operating income, net	54.0	47.6	106.0	95.0
Operating (loss) income	78.2	97.1	222.5	231.3
Intercompany interest income (expense)	(34.8)	(9.0)	(41.8)	(17.1)
Interest expense, net	(7.8)	(1.0)	(9.6)	(1.9)
(Loss) income before income taxes	35.6	87.1	171.1	212.3
Income taxes	(13.3)	(33.1)	(69.2)	(81.9)
Equity in income of subsidiaries	31.9	59.9	123.1	143.6
Net income	54.2	113.9	225.0	274.0
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Sales	18.4	9.9	30.8	21.8
Cost of sales	(5.5)	(0.3)	(6.8)	(1.8)
Gross margin	12.9	9.6	24.0	20.0
Selling, general and administrative expenses	(6.9)	0.8	(13.2)	(0.2)
Other operating income, net	(0.3)	(1.3)	1.7	(1.7)
Operating (loss) income	5.7	9.1	12.5	18.1
Intercompany interest income (expense)	31.0	9.0	38.0	17.1
Interest expense, net	(2.0)		(2.0)
(Loss) income before income taxes	34.7	18.1	48.5	35.2
Income taxes	1.5	(4.0)	5.1	(5.3)
Equity in income of subsidiaries	25.8	54.0	106.6	130.0
Net income	$ 62.0	$ 68.1	$ 160.2	$ 159.9