Condensed Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Cash flows from operating activities
Net income (loss)	$ 15.0	$ (1.3)	$ 196.0	$ 153.3
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	45.0	40.3	129.5	104.8
Amortization of unfavorable leases and contracts	(7.0)	(8.9)	(24.6)	(14.8)
Pension benefit	0.0	(0.6)	0.0	(1.8)
Share-based compensation	4.7	3.5	11.8	10.7
Deferred taxation	(5.9)	(28.0)	8.0	(32.2)
Excess tax benefit from exercise of share awards	0.0	0.0	(5.1)	(7.7)
Amortization of debt discount and issuance costs	1.0	1.0	2.6	6.5
Other non-cash movements	0.7	0.6	2.7	0.7
Changes in operating assets and liabilities:
Decrease in accounts receivable	41.6	23.5	116.3	81.8
Decrease (increase) in other receivables and other assets	2.1	(0.9)	1.6	(4.9)
Increase in other current assets	(17.6)	(13.9)	(12.8)	(36.7)
Increase in inventories	(317.7)	(338.2)	(289.3)	(321.1)
Increase in accounts payable	174.4	161.8	93.6	132.9
(Decrease) increase in accrued expenses and other liabilities	(31.9)	4.0	(60.5)	(15.0)
Increase in deferred revenue	1.0	8.2	25.0	29.2
Decrease in income taxes payable	(26.8)	(58.2)	(104.1)	(106.7)
Pension plan contributions	(0.5)	(1.0)	(2.0)	(3.2)
Net cash (used in) provided by operating activities	(121.9)	(208.1)	88.7	(24.2)
Investing activities
Purchase of property, plant and equipment	(71.9)	(75.1)	(170.8)	(165.1)
Purchase of available-for-sale securities	(1.9)	(3.0)	(3.8)	(4.2)
Proceeds from sale of available-for-sale securities	0.0	1.5	3.6	2.5
Acquisition of Zale Corporation, net of cash acquired	0.0	0.0	0.0	(1,429.2)
Net cash used in investing activities	(73.8)	(76.6)	(171.0)	(1,596.0)
Financing activities
Dividends paid	(17.5)	(14.4)	(49.6)	(40.8)
Proceeds from issuance of common shares	3.1	2.2	3.3	4.2
Excess tax benefit from exercise of share awards	0.0	0.0	5.1	7.7
Repayments of debt	(550.1)	(498.4)	(1,756.4)	(829.0)
Proceeds from Lines of Credit	177.0	145.0	177.0	145.0
Repayments of Lines of Credit	(30.0)	0.0	(30.0)	0.0
Payment of debt issuance costs	0.0	(2.1)	0.0	(20.5)
Repurchase of common shares	(30.0)	(7.4)	(111.9)	(29.8)
Net settlement of equity based awards	0.0	(3.0)	(8.3)	(18.1)
Principal payments under capital lease obligations	(0.2)	(0.3)	(0.8)	(0.5)
Proceeds from (repayment of) short-term borrowings	18.5	43.0	(1.5)	20.8
Net cash provided by (used in) financing activities	113.4	158.0	(34.2)	1,461.4
Cash and cash equivalents at beginning of period	159.8	215.0	193.6	247.6
Decrease in cash and cash equivalents	(82.3)	(126.7)	(116.5)	(158.8)
Effect of exchange rate changes on cash and cash equivalents	(0.3)	(0.7)	0.1	(1.2)
Cash and cash equivalents at end of period	77.2	87.6	77.2	87.6
Term Loan
Financing activities
Proceeds from securitization facility	0.0	0.0	0.0	400.0
Repayments of debt	(7.5)	(5.0)	(17.5)	(5.0)
Securitization facility
Financing activities
Proceeds from securitization facility	542.6	493.4	1,738.9	1,424.0
Repayments of debt	(542.6)	(493.4)	(1,738.9)	(824.0)
Signet UK Finance plc | Senior Unsecured Notes Due in 2024
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Amortization of debt discount and issuance costs	0.2	0.2	0.5	0.3
Financing activities
Proceeds from securitization facility	0.0	0.0	0.0	398.4
Credit Facility [Member] | Revolving Credit Facility
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Amortization of debt discount and issuance costs	0.4	0.3	1.0	0.6
Financing activities
Proceeds from Lines of Credit	177.0	145.0	177.0	145.0
Repayments of Lines of Credit	$ (30.0)	$ 0.0	$ (30.0)	$ 0.0