Condensed consolidating financial information - Condensed consolidated balance sheet (Details) - USD ($) $ in Millions	Oct. 29, 2016	Jan. 30, 2016	Oct. 31, 2015	Jan. 31, 2015
Current assets:
Cash and cash equivalents	$ 82.7	$ 137.7	$ 77.2	$ 193.6
Accounts receivable, net	1,581.1	1,756.4	1,451.5
Intra-entity receivables, net	0.0	0.0	0.0
Other receivables	74.2	84.0	55.4
Other current assets	146.8	152.6	141.4
Income taxes	20.8	3.5	24.6
Inventories	2,649.4	2,453.9	2,727.0
Total current assets	4,555.0	4,588.1	4,477.1
Non-current assets:
Property, plant and equipment, net	791.1	727.6	718.0
Goodwill	517.0	515.5	517.6	519.2
Intangible assets, net	419.8	427.8	434.3
Investment in subsidiaries	0.0		0.0
Intra-entity receivables, net	0.0		0.0
Other assets	157.5	154.6	136.4
Deferred tax assets	0.0	0.0	1.8
Retirement benefit asset	47.1	51.3	40.7
Total assets	6,487.5	6,464.9	6,325.9
Current liabilities:
Loans and overdrafts	288.8	57.7	248.0
Accounts payable	382.2	269.1	371.4
Intra-entity payables, net		0.0	0.0
Accrued expenses and other current liabilities	402.9	498.3	408.0
Deferred revenue	256.7	260.3	241.4
Income taxes	4.4	65.7	0.7
Total current liabilities	1,335.0	1,151.1	1,269.5
Non-current liabilities:
Long-term debt	1,324.2	1,321.0	1,330.6
Intra-entity payables, net			0.0
Other liabilities	219.9	230.5	226.6
Deferred revenue	632.1	629.1	597.5
Deferred tax liabilities	133.4	72.5	56.7
Total liabilities	3,644.6	3,404.2	3,480.9
Shareholders’ equity:
Total shareholders’ equity	2,231.2	3,060.7	2,845.0
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	6,487.5	6,464.9	6,325.9
Consolidation, Eliminations
Current assets:
Cash and cash equivalents	0.0	0.0	0.0	0.0
Accounts receivable, net	0.0	0.0	0.0
Intra-entity receivables, net	(329.3)	(408.8)	(244.0)
Other receivables	0.0	0.0	0.0
Other current assets	0.0	0.0	0.0
Income taxes	0.0	0.0	0.0
Inventories	0.0	0.0	0.0
Total current assets	(329.3)	(408.8)	(244.0)
Non-current assets:
Property, plant and equipment, net	0.0		0.0
Goodwill	0.0		0.0
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	(3,873.6)	(4,410.7)	(3,867.1)
Intra-entity receivables, net	(4,055.0)	(3,870.0)	(3,882.2)
Other assets	0.0		0.0
Deferred tax assets	0.0		0.0
Retirement benefit asset	0.0		0.0
Total assets	(8,257.9)	(8,689.5)	(7,993.3)
Current liabilities:
Loans and overdrafts	0.0	0.0	0.0
Accounts payable	0.0	0.0	0.0
Intra-entity payables, net	(329.3)	(408.8)	(244.0)
Accrued expenses and other current liabilities	0.0	0.0	0.0
Deferred revenue	0.0	0.0	0.0
Income taxes	0.0	0.0	0.0
Total current liabilities	(329.3)	(408.8)	(244.0)
Non-current liabilities:
Intra-entity payables, net	(4,055.0)	(3,870.0)	(3,882.2)
Other liabilities			0.0
Deferred revenue			0.0
Deferred tax liabilities		0.0	0.0
Total liabilities	(4,384.3)	(4,278.8)	(4,126.2)
Shareholders’ equity:
Total shareholders’ equity	(3,873.6)	(4,410.7)	(3,867.1)
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	(8,257.9)	(8,689.5)	(7,993.3)
Signet Jewelers Limited | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.2	1.9	3.1	2.1
Accounts receivable, net	0.0	0.0	0.0
Intra-entity receivables, net	50.4	28.7	61.9
Other receivables	0.0	0.0	0.0
Other current assets		0.1	0.2
Income taxes	0.0	0.0	0.0
Inventories	0.0	0.0	0.0
Total current assets	50.6	30.7	65.2
Non-current assets:
Property, plant and equipment, net	0.0		0.0
Goodwill	0.0		0.0
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	2,812.5	3,047.8	2,797.6
Intra-entity receivables, net	0.0		0.0
Other assets	0.0		0.0
Deferred tax assets	0.0		0.0
Retirement benefit asset	0.0		0.0
Total assets	2,863.1	3,078.5	2,862.8
Current liabilities:
Loans and overdrafts	0.0	0.0	0.0
Accounts payable	0.0	0.0	0.0
Intra-entity payables, net	0.0	0.0	0.0
Accrued expenses and other current liabilities	20.2	17.8	17.8
Deferred revenue	0.0	0.0	0.0
Income taxes	0.0	0.0	0.0
Total current liabilities	20.2	17.8	17.8
Non-current liabilities:
Intra-entity payables, net			0.0
Other liabilities			0.0
Deferred revenue			0.0
Deferred tax liabilities		0.0	0.0
Total liabilities	20.2	17.8	17.8
Shareholders’ equity:
Total shareholders’ equity	2,231.2	3,060.7	2,845.0
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	2,863.1	3,078.5	2,862.8
Signet UK Finance plc | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.1	0.1	0.1	0.1
Accounts receivable, net	0.0	0.0	0.0
Intra-entity receivables, net	0.0	0.0	0.0
Other receivables	0.0	0.0	0.0
Other current assets		0.0	0.0
Income taxes	0.1	0.2	0.0
Inventories	0.0	0.0	0.0
Total current assets	0.2	0.3	0.1
Non-current assets:
Property, plant and equipment, net	0.0	0.0	0.0
Goodwill	0.0	0.0	0.0
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	0.0	0.0	0.0
Intra-entity receivables, net	407.6	402.6	407.2
Other assets		0.0	0.0
Deferred tax assets	0.0	0.0	0.0
Retirement benefit asset	0.0	0.0	0.0
Total assets	407.8	402.9	407.3
Current liabilities:
Loans and overdrafts	(0.7)	(0.7)	(0.7)
Accounts payable	0.0	0.0	0.0
Intra-entity payables, net	0.0	0.0	0.0
Accrued expenses and other current liabilities	7.1	2.4	7.1
Deferred revenue	0.0	0.0	0.0
Income taxes		0.0	(0.2)
Total current liabilities	6.4	1.7	6.2
Non-current liabilities:
Long-term debt	394.1	393.5	393.3
Intra-entity payables, net		0.0	0.0
Other liabilities		0.0	0.0
Deferred revenue		0.0	0.0
Deferred tax liabilities		0.0	0.0
Total liabilities	400.5	395.2	399.5
Shareholders’ equity:
Total shareholders’ equity	7.3	7.7	7.8
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	407.8	402.9	407.3
Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	55.7	102.0	61.0	166.5
Accounts receivable, net	1,581.1	1,753.0	1,447.1
Intra-entity receivables, net	0.0	0.0	0.0
Other receivables	52.0	68.8	45.4
Other current assets	140.3	144.2	135.4
Income taxes	35.6	2.3	24.6
Inventories	2,578.3	2,372.7	2,643.1
Total current assets	4,443.0	4,443.0	4,356.6
Non-current assets:
Property, plant and equipment, net	786.4	722.3	712.5
Goodwill	513.4	511.9	514.0
Intangible assets, net	419.8	427.8	434.3
Investment in subsidiaries	586.7	762.9	532.4
Intra-entity receivables, net	0.0		0.0
Other assets	126.2	124.5	108.0
Deferred tax assets			1.1
Retirement benefit asset	47.1	51.3	40.7
Total assets	6,922.6	7,043.7	6,699.6
Current liabilities:
Loans and overdrafts	289.5	58.4	248.7
Accounts payable	376.4	260.3	367.4
Intra-entity payables, net	329.3	408.8	244.0
Accrued expenses and other current liabilities	360.1	467.0	372.8
Deferred revenue	256.7	260.3	241.4
Income taxes	3.9	68.4	(14.9)
Total current liabilities	1,615.9	1,523.2	1,459.4
Non-current liabilities:
Long-term debt	330.1	327.5	337.3
Intra-entity payables, net	4,055.0	3,870.0	3,882.2
Other liabilities	213.7	223.6	219.5
Deferred revenue	632.1	629.1	597.5
Deferred tax liabilities	133.5	73.0	56.7
Total liabilities	6,980.3	6,646.4	6,552.6
Shareholders’ equity:
Total shareholders’ equity	(57.7)	397.3	147.0
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	6,922.6	7,043.7	6,699.6
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	26.7	33.7	13.0	$ 24.9
Accounts receivable, net		3.4	4.4
Intra-entity receivables, net	278.9	380.1	182.1
Other receivables	22.2	15.2	10.0
Other current assets	6.5	8.3	5.8
Income taxes	(14.9)	1.0	0.0
Inventories	71.1	81.2	83.9
Total current assets	390.5	522.9	299.2
Non-current assets:
Property, plant and equipment, net	4.7	5.3	5.5
Goodwill	3.6	3.6	3.6
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	474.4	600.0	537.1
Intra-entity receivables, net	3,647.4	3,467.4	3,475.0
Other assets	31.3	30.1	28.4
Deferred tax assets			0.7
Retirement benefit asset	0.0		0.0
Total assets	4,551.9	4,629.3	4,349.5
Current liabilities:
Loans and overdrafts	0.0	0.0	0.0
Accounts payable	5.8	8.8	4.0
Intra-entity payables, net	0.0	0.0	0.0
Accrued expenses and other current liabilities	15.5	11.1	10.3
Deferred revenue	0.0	0.0	0.0
Income taxes	0.5	(2.7)	15.8
Total current liabilities	21.8	17.2	30.1
Non-current liabilities:
Long-term debt	600.0	600.0	600.0
Intra-entity payables, net			0.0
Other liabilities	6.2	6.9	7.1
Deferred revenue			0.0
Deferred tax liabilities	(0.1)	(0.5)	0.0
Total liabilities	627.9	623.6	637.2
Shareholders’ equity:
Total shareholders’ equity	3,924.0	4,005.7	3,712.3
Total liabilities, redeemable convertible preferred shares and shareholders’ equity	4,551.9	4,629.3	4,349.5
Series A Redeemable Convertible Preferred Stock
Non-current liabilities:
Series A redeemable convertible preferred shares	611.7	$ 0.0	$ 0.0
Series A Redeemable Convertible Preferred Stock | Consolidation, Eliminations
Non-current liabilities:
Series A redeemable convertible preferred shares	0.0
Series A Redeemable Convertible Preferred Stock | Signet Jewelers Limited | Reportable Legal Entities
Non-current liabilities:
Series A redeemable convertible preferred shares	611.7
Series A Redeemable Convertible Preferred Stock | Signet UK Finance plc | Reportable Legal Entities
Non-current liabilities:
Series A redeemable convertible preferred shares	0.0
Series A Redeemable Convertible Preferred Stock | Guarantor Subsidiaries | Reportable Legal Entities
Non-current liabilities:
Series A redeemable convertible preferred shares	0.0
Series A Redeemable Convertible Preferred Stock | Non-Guarantor Subsidiaries | Reportable Legal Entities
Non-current liabilities:
Series A redeemable convertible preferred shares	$ 0.0