Condensed Consolidated Statement of Comprehensive Income (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]
Net income	$ 58.0	$ 67.4	$ 154.6	$ 159.2
Other comprehensive income (loss):
Foreign currency translation adjustments	(2.3)	(5.2)	7.3	(7.0)
Available-for-sale securities:
Unrealized loss	(0.2)		(0.2)
Cash flow hedges:
Unrealized gain (loss)	(0.1)	(5.4)	0.2	(16.8)
Reclassification adjustment for losses (gains) to net income	3.4	(0.1)	8.1	(0.7)
Pension plan:
Reclassification adjustment to net income for amortization of actuarial loss	0.4	0.4	0.8	0.9
Prior service (benefit) costs
Reclassification adjustment to net income for amortization of prior service credits	(0.4)	(0.2)	(0.7)	(0.6)
After-tax amount, Total other comprehensive income (loss)	0.8	(10.5)	15.5	(24.2)
Total comprehensive income (loss)	58.8	56.9	170.1	135.0
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income	(116.1)	(182.0)	(385.1)	(433.9)
Other comprehensive income (loss):
Foreign currency translation adjustments	2.2	4.7	(6.9)	6.4
Available-for-sale securities:
Unrealized loss	0.2		0.2
Cash flow hedges:
Unrealized gain (loss)	0.1	5.4	(0.2)	16.8
Reclassification adjustment for losses (gains) to net income	(3.4)	0.1	(8.1)	0.7
Pension plan:
Actuarial gain (loss)	(0.4)
Reclassification adjustment to net income for amortization of actuarial loss		(0.4)	(0.8)	(0.9)
Prior service (benefit) costs
Reclassification adjustment to net income for amortization of prior service credits	0.4	0.2	0.7	0.6
After-tax amount, Total other comprehensive income (loss)	(0.9)	10.0	(15.1)	23.6
Total comprehensive income (loss)	(117.0)	(172.0)	(400.2)	(410.3)
Signet Jewelers Limited
Condensed Financial Statements, Captions [Line Items]
Net income	58.0	67.4	154.6	159.2
Other comprehensive income (loss):
Foreign currency translation adjustments	(2.3)	(5.2)	7.3	(7.0)
Available-for-sale securities:
Unrealized loss	(0.2)		(0.2)
Cash flow hedges:
Unrealized gain (loss)	(0.1)	(5.4)	0.2	(16.8)
Reclassification adjustment for losses (gains) to net income	3.4	(0.1)	8.1	(0.7)
Pension plan:
Reclassification adjustment to net income for amortization of actuarial loss	0.4	0.4	0.8	0.9
Prior service (benefit) costs
Reclassification adjustment to net income for amortization of prior service credits	(0.4)	(0.2)	(0.7)	(0.6)
After-tax amount, Total other comprehensive income (loss)	0.8	(10.5)	15.5	(24.2)
Total comprehensive income (loss)	58.8	56.9	170.1	135.0
Signet UK Finance plc
Condensed Financial Statements, Captions [Line Items]
Net income	(0.1)		(0.1)
Pension plan:
Prior service (benefit) costs
Total comprehensive income (loss)	(0.1)		(0.1)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income	54.2	113.9	225.0	274.0
Other comprehensive income (loss):
Foreign currency translation adjustments	(2.6)	(5.9)	8.3	(8.0)
Cash flow hedges:
Unrealized gain (loss)	(0.1)	(5.4)	0.2	(16.8)
Reclassification adjustment for losses (gains) to net income	3.4	(0.1)	8.1	(0.7)
Pension plan:
Reclassification adjustment to net income for amortization of actuarial loss	0.4	0.4	0.8	0.9
Prior service (benefit) costs
Reclassification adjustment to net income for amortization of prior service credits	(0.4)	(0.2)	(0.7)	(0.6)
After-tax amount, Total other comprehensive income (loss)	0.7	(11.2)	(16.7)	(25.2)
Total comprehensive income (loss)	54.9	102.7	241.7	248.8
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income	62.0	68.1	160.2	159.9
Other comprehensive income (loss):
Foreign currency translation adjustments	0.4	1.2	(1.4)	1.6
Available-for-sale securities:
Unrealized loss	(0.2)		(0.2)
Pension plan:
Prior service (benefit) costs
After-tax amount, Total other comprehensive income (loss)	0.2	1.2	(1.6)	1.6
Total comprehensive income (loss)	$ 62.2	$ 69.3	$ 158.6	$ 161.5