Condensed Consolidated Statement of Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	May 03, 2014	May 04, 2013
Condensed Financial Statements, Captions [Line Items]
Net income	$ 96.6	$ 91.8
Other comprehensive income (loss):
Foreign currency translation adjustments	9.6	(1.8)
Cash flow hedges:
Unrealized gain (loss)	0.3	(11.4)
Reclassification adjustment for losses (gains) to net income	4.7	(0.6)
Pension plan:
Actuarial gain (loss)
Reclassification adjustment to net income for amortization of actuarial loss	0.4	0.5
Prior service (benefit) costs
Reclassification adjustment to net income for amortization of prior service credits	(0.3)	(0.4)
After-tax amount, Total other comprehensive income (loss)	14.7	(13.7)
Total comprehensive income	111.3	78.1
Signet Jewelers Limited
Condensed Financial Statements, Captions [Line Items]
Net income	96.6	91.8
Pension plan:
Actuarial gain (loss)
Prior service (benefit) costs
Total comprehensive income	96.6	91.8
Signet UK Finance plc
Pension plan:
Actuarial gain (loss)
Prior service (benefit) costs
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income	170.8	160.1
Other comprehensive income (loss):
Foreign currency translation adjustments	10.9	(2.1)
Cash flow hedges:
Unrealized gain (loss)	0.3	(11.4)
Reclassification adjustment for losses (gains) to net income	4.7	(0.6)
Pension plan:
Actuarial gain (loss)
Reclassification adjustment to net income for amortization of actuarial loss	0.5	0.5
Prior service (benefit) costs
Reclassification adjustment to net income for amortization of prior service credits	(0.4)	(0.4)
After-tax amount, Total other comprehensive income (loss)	16.0	(14.0)
Total comprehensive income	186.8	146.1
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income	98.2	91.8
Other comprehensive income (loss):
Foreign currency translation adjustments	(1.8)	0.4
Pension plan:
Actuarial gain (loss)
Prior service (benefit) costs
After-tax amount, Total other comprehensive income (loss)	(1.8)	0.4
Total comprehensive income	96.4	92.2
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income	(269.0)	(251.9)
Other comprehensive income (loss):
Foreign currency translation adjustments	0.5	(0.1)
Pension plan:
Actuarial gain (loss)
Prior service (benefit) costs
After-tax amount, Total other comprehensive income (loss)	0.5	(0.1)
Total comprehensive income	$ (268.5)	$ (252.0)