Condensed Consolidated Statement of Cash Flows (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
Cash flows from operating activities
Other cash provided by (used in) operating activities	$ 110.4	$ 13.4	$ 183.9	$ 58.5
Net cash provided by (used in) operating activities	110.4	13.4	183.9	58.5
Investing activities
Purchase of property, plant and equipment	(61.9)	(30.4)	(90.0)	(53.6)
Purchase of available-for-sale securities	(1.2)		(1.2)
Proceeds from available-for-sale securities	1.0		1.0
Net cash (used in) provided by investing activities	(1,491.3)	(29.0)	(1,519.4)	(52.2)
Financing activities
Dividends paid	(14.4)	(12.1)	(26.4)	(21.9)
Proceeds from issuance of common shares	1.0	0.2	2.0	5.2
Excess tax benefit from exercise of share awards		4.5	7.7	4.5
Proceeds from long-term debt	1,398.4		1,398.4
Payment of debt issuance costs	(15.4)		(18.4)
Repurchase of common shares	(11.0)	(25.0)	(22.4)	(75.1)
Net settlement of equity based awards	0.2	0.1	(15.1)	(9.0)
Capital lease payments	(0.2)		(0.2)
Proceeds from short-term borrowings	(11.7)	(4.0)	(22.2)	1.7
Net cash (used in) provided by financing activities	1,346.9	(36.3)	1,303.4	(94.6)
Cash and cash equivalents at beginning of period	249.1		247.6	301.0
(Decrease) increase in cash and cash equivalents	(34.0)	(51.9)	(32.1)	(88.3)
Effect of exchange rate changes on cash and cash equivalents	(0.1)	1.1	(0.5)	0.2
Cash and cash equivalents at end of period	215.0	212.9	215.0	212.9
Zale Corporation
Investing activities
Acquisition of business, net of cash received	(1,429.2)		(1,429.2)
Ultra Stores
Investing activities
Acquisition of business, net of cash received		1.4		1.4
Eliminations
Cash flows from operating activities
Other cash provided by (used in) operating activities	(50.0)	(50.0)	(50.0)	(90.0)
Net cash provided by (used in) operating activities	(50.0)	(50.0)	(50.0)	(90.0)
Investing activities
Investment in subsidiaries	7.4	0.3	7.4	0.3
Net cash (used in) provided by investing activities	7.4	0.3	7.4	0.3
Financing activities
Intercompany dividends paid	850.0	50.0	850.0	90.0
Proceeds from issuance of common shares	(807.4)	(0.3)	(807.4)	(0.3)
Net cash (used in) provided by financing activities	42.6	49.7	42.6	89.7
Signet Jewelers Limited
Cash flows from operating activities
Other cash provided by (used in) operating activities	49.6	49.4	49.1	88.9
Net cash provided by (used in) operating activities	49.6	49.4	49.1	88.9
Investing activities
Investment in subsidiaries		(0.3)		(0.3)
Net cash (used in) provided by investing activities		(0.3)		(0.3)
Financing activities
Dividends paid	(14.4)	(12.1)	(26.4)	(21.9)
Proceeds from issuance of common shares	1.0	0.2	2.0	5.2
Repurchase of common shares	(11.0)	(25.0)	(22.4)	(75.1)
Net settlement of equity based awards	0.2	0.1	(15.1)	(9.0)
Intercompany activity, net	(25.7)	(20.8)	12.8	(0.3)
Net cash (used in) provided by financing activities	(49.9)	(57.6)	(49.1)	(101.1)
Cash and cash equivalents at beginning of period	1.7		1.4	13.4
(Decrease) increase in cash and cash equivalents	(0.3)	(8.5)		(12.5)
Cash and cash equivalents at end of period	1.4	0.9	1.4	0.9
Signet UK Finance plc
Cash flows from operating activities
Other cash provided by (used in) operating activities	3.8		3.8
Net cash provided by (used in) operating activities	3.8		3.8
Financing activities
Proceeds from issuance of common shares	7.4		7.4
Proceeds from long-term debt	398.4		398.4
Payment of debt issuance costs	(5.7)		(5.7)
Intercompany activity, net	(403.9)		(403.9)
Net cash (used in) provided by financing activities	(3.8)		(3.8)
Guarantor Subsidiaries
Cash flows from operating activities
Other cash provided by (used in) operating activities	76.9	14.1	139.3	45.2
Net cash provided by (used in) operating activities	76.9	14.1	139.3	45.2
Investing activities
Purchase of property, plant and equipment	(61.8)	(30.2)	(89.6)	(53.4)
Investment in subsidiaries	(7.4)		(7.4)
Net cash (used in) provided by investing activities	(1,500.3)	(28.8)	(1,528.1)	(52.0)
Financing activities
Intercompany dividends paid	(850.2)	(43.7)	(849.1)	(77.0)
Proceeds from issuance of common shares		0.3		0.3
Excess tax benefit from exercise of share awards		4.5	7.7	4.5
Proceeds from long-term debt	400.0		400.0
Payment of debt issuance costs	(7.4)		(10.4)
Capital lease payments	(0.2)		(0.2)
Proceeds from short-term borrowings	(11.7)	(4.0)	(22.2)	1.7
Intercompany activity, net	1,857.9	36.1	1,815.5	10.9
Net cash (used in) provided by financing activities	1,388.4	(6.8)	1,341.3	(59.6)
Cash and cash equivalents at beginning of period	226.7		237.0	271.3
(Decrease) increase in cash and cash equivalents	(35.0)	(21.5)	(47.5)	(66.4)
Effect of exchange rate changes on cash and cash equivalents	(0.6)	(0.4)	1.6	(1.8)
Cash and cash equivalents at end of period	191.1	203.1	191.1	203.1
Guarantor Subsidiaries | Zale Corporation
Investing activities
Acquisition of business, net of cash received	(1,431.1)		(1,431.1)
Guarantor Subsidiaries | Ultra Stores
Investing activities
Acquisition of business, net of cash received		1.4		1.4
Non-Guarantor Subsidiaries
Cash flows from operating activities
Other cash provided by (used in) operating activities	30.1	(0.1)	41.7	14.4
Net cash provided by (used in) operating activities	30.1	(0.1)	41.7	14.4
Investing activities
Purchase of property, plant and equipment	(0.1)	(0.2)	(0.4)	(0.2)
Purchase of available-for-sale securities	(1.2)		(1.2)
Proceeds from available-for-sale securities	1.0		1.0
Net cash (used in) provided by investing activities	1.6	(0.2)	1.3	(0.2)
Financing activities
Intercompany dividends paid	0.2	(6.3)	(0.9)	(13.0)
Proceeds from issuance of common shares	800.0		800.0
Proceeds from long-term debt	600.0		600.0
Payment of debt issuance costs	(2.3)		(2.3)
Intercompany activity, net	(1,428.3)	(15.3)	(1,424.4)	(10.6)
Net cash (used in) provided by financing activities	(30.4)	(21.6)	(27.6)	(23.6)
Cash and cash equivalents at beginning of period	20.7		9.2	16.3
(Decrease) increase in cash and cash equivalents	1.3	(21.9)	15.4	(9.4)
Effect of exchange rate changes on cash and cash equivalents	0.5	1.5	(2.1)	2.0
Cash and cash equivalents at end of period	22.5	8.9	22.5	8.9
Non-Guarantor Subsidiaries | Zale Corporation
Investing activities
Acquisition of business, net of cash received	$ 1.9		$ 1.9