Condensed Consolidated Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Cash flows from operating activities
Other cash (used in) provided by operating activities	$ (208.1)	$ (80.4)	$ (24.2)	$ (21.9)
Net cash (used in) provided by operating activities	(208.1)	(80.4)	(24.2)	(21.9)
Investing activities
Purchase of property, plant and equipment	(75.1)	(53.3)	(165.1)	(106.9)
Purchase of available-for-sale securities	(3.0)		(4.2)
Proceeds from available-for-sale securities	1.5		2.5
Net cash (used in) provided by investing activities	(76.6)	(53.3)	(1,596.0)	(105.5)
Financing activities
Dividends paid	(14.4)	(12.1)	(40.8)	(34.0)
Proceeds from issuance of common shares	2.2	2.8	4.2	8.0
Excess tax benefit from exercise of share awards			7.7	4.5
Proceeds from long-term debt	493.4		2,222.4
Repayments of long-term debt	(498.4)		(829.0)
Payment of debt issuance costs	(2.1)		(20.5)
Repurchase of common shares	(7.4)	(25.0)	(29.8)	(100.1)
Net settlement of equity based awards	(3.0)	(0.1)	(18.1)	(9.1)
Capital lease payments	(0.3)		(0.5)
Proceeds from short-term borrowings	188.0	44.3	165.8	46.0
Net cash (used in) provided by financing activities	158.0	9.9	1,461.4	(84.7)
Cash and cash equivalents at beginning of period	215.0	212.9	247.6	301.0
(Decrease) increase in cash and cash equivalents	(126.7)	(123.8)	(158.8)	(212.1)
Effect of exchange rate changes on cash and cash equivalents	(0.7)	(1.3)	(1.2)	(1.1)
Cash and cash equivalents at end of period	87.6	87.8	87.6	87.8
Zale Corporation
Investing activities
Acquisition of business, net of cash received			(1,429.2)
Ultra Stores
Investing activities
Acquisition of business, net of cash received				1.4
Eliminations
Cash flows from operating activities
Other cash (used in) provided by operating activities	(100.0)		(150.0)	(90.0)
Net cash (used in) provided by operating activities	(100.0)		(150.0)	(90.0)
Investing activities
Investment in subsidiaries	1.4		8.8	0.3
Net cash (used in) provided by investing activities	1.4		8.8	0.3
Financing activities
Intercompany dividends	100.0		950.0	90.0
Proceeds from issuance of common shares	(1.4)		(808.8)	(0.3)
Net cash (used in) provided by financing activities	98.6		141.2	89.7
Signet Jewelers Limited
Cash flows from operating activities
Other cash (used in) provided by operating activities	99.3	(0.5)	148.4	88.4
Net cash (used in) provided by operating activities	99.3	(0.5)	148.4	88.4
Investing activities
Investment in subsidiaries				(0.3)
Net cash (used in) provided by investing activities				(0.3)
Financing activities
Dividends paid	(14.4)	(12.1)	(40.8)	(34.0)
Proceeds from issuance of common shares	2.2	2.8	4.2	8.0
Repurchase of common shares	(7.4)	(25.0)	(29.8)	(100.1)
Net settlement of equity based awards	(3.0)	(0.1)	(18.1)	(9.1)
Intercompany activity, net	(75.2)	37.2	(62.4)	36.9
Net cash (used in) provided by financing activities	(97.8)	2.8	(146.9)	(98.3)
Cash and cash equivalents at beginning of period	1.4	0.9	1.4	13.4
(Decrease) increase in cash and cash equivalents	1.5	2.3	1.5	(10.2)
Cash and cash equivalents at end of period	2.9	3.2	2.9	3.2
Signet UK Finance plc
Cash flows from operating activities
Other cash (used in) provided by operating activities	4.5		8.3
Net cash (used in) provided by operating activities	4.5		8.3
Financing activities
Proceeds from issuance of common shares	1.4		8.8
Proceeds from long-term debt			398.4
Payment of debt issuance costs	(1.3)		(7.0)
Intercompany activity, net	(4.6)		(408.5)
Net cash (used in) provided by financing activities	(4.5)		(8.3)
Guarantor Subsidiaries
Cash flows from operating activities
Other cash (used in) provided by operating activities	(253.1)	(93.9)	(113.8)	(48.7)
Net cash (used in) provided by operating activities	(253.1)	(93.9)	(113.8)	(48.7)
Investing activities
Purchase of property, plant and equipment	(75.1)	(53.3)	(164.7)	(106.7)
Investment in subsidiaries	(1.4)		(8.8)
Net cash (used in) provided by investing activities	(76.5)	(53.3)	(1,604.6)	(105.3)
Financing activities
Intercompany dividends	(100.0)	7.5	(949.1)	(69.5)
Proceeds from issuance of common shares				0.3
Excess tax benefit from exercise of share awards			7.7	4.5
Proceeds from long-term debt			400.0
Repayments of long-term debt	(5.0)		(5.0)
Payment of debt issuance costs	(0.3)		(10.7)
Capital lease payments	(0.3)		(0.5)
Proceeds from short-term borrowings	188.0	44.3	165.8	46.0
Intercompany activity, net	135.0	(43.5)	1,950.5	(32.6)
Net cash (used in) provided by financing activities	217.4	8.3	1,558.7	(51.3)
Cash and cash equivalents at beginning of period	191.1	203.1	237.0	271.3
(Decrease) increase in cash and cash equivalents	(112.2)	(138.9)	(159.7)	(205.3)
Effect of exchange rate changes on cash and cash equivalents	(4.8)	1.7	(3.2)	(0.1)
Cash and cash equivalents at end of period	74.1	65.9	74.1	65.9
Guarantor Subsidiaries | Zale Corporation
Investing activities
Acquisition of business, net of cash received			(1,431.1)
Guarantor Subsidiaries | Ultra Stores
Investing activities
Acquisition of business, net of cash received				1.4
Non-Guarantor Subsidiaries
Cash flows from operating activities
Other cash (used in) provided by operating activities	41.2	14.0	82.9	28.4
Net cash (used in) provided by operating activities	41.2	14.0	82.9	28.4
Investing activities
Purchase of property, plant and equipment			(0.4)	(0.2)
Purchase of available-for-sale securities	(3.0)		(4.2)
Proceeds from available-for-sale securities	1.5		2.5
Net cash (used in) provided by investing activities	(1.5)		(0.2)	(0.2)
Financing activities
Intercompany dividends		(7.5)	(0.9)	(20.5)
Proceeds from issuance of common shares			800.0
Proceeds from long-term debt	493.4		1,424.0
Repayments of long-term debt	(493.4)		(824.0)
Payment of debt issuance costs	(0.5)		(2.8)
Intercompany activity, net	(55.2)	6.3	(1,479.6)	(4.3)
Net cash (used in) provided by financing activities	(55.7)	(1.2)	(83.3)	(24.8)
Cash and cash equivalents at beginning of period	22.5	8.9	9.2	16.3
(Decrease) increase in cash and cash equivalents	(16.0)	12.8	(0.6)	3.4
Effect of exchange rate changes on cash and cash equivalents	4.1	(3.0)	2.0	(1.0)
Cash and cash equivalents at end of period	10.6	18.7	10.6	18.7
Non-Guarantor Subsidiaries | Zale Corporation
Investing activities
Acquisition of business, net of cash received			$ 1.9