Condensed consolidating financial information - Condensed consolidated balance sheet (Details) - USD ($) $ in Millions	Jul. 30, 2016	Jan. 30, 2016	Aug. 01, 2015	Jan. 31, 2015
Current assets:
Cash and cash equivalents	$ 118.7	$ 137.7	$ 159.8	$ 193.6
Accounts receivable, net	1,650.6	1,756.4	1,493.2
Intra-entity receivables, net	0.0	0.0	0.0
Other receivables	66.9	84.0	55.2
Other current assets	152.0	152.6	125.0
Income taxes	1.4	3.5	3.0
Inventories	2,418.3	2,453.9	2,414.2
Total current assets	4,407.9	4,588.1	4,250.4
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $1,003.1, $949.2 and $915.1, respectively	739.5	727.6	685.1
Goodwill	518.1	515.5	517.6	519.2
Intangible assets, net	424.7	427.8	437.8
Investment in subsidiaries	0.0		0.0
Intra-entity receivables, net	0.0		0.0
Other assets	158.0	154.6	136.8
Deferred tax assets	0.0	0.0	3.2
Retirement benefit asset	49.8	51.3	40.4
Total assets	6,298.0	6,464.9	6,071.3
Current liabilities:
Loans and overdrafts	238.6	57.7	80.2
Accounts payable	195.1	269.1	194.0
Intra-entity payables, net		0.0	0.0
Accrued expenses and other current liabilities	417.6	498.3	453.1
Deferred revenue	254.5	260.3	230.2
Income taxes	38.3	65.7	5.8
Total current liabilities	1,144.1	1,151.1	963.3
Non-current liabilities:
Long-term debt	1,330.5	1,321.0	1,340.1
Intra-entity payables, net			0.0
Other liabilities	223.8	230.5	226.2
Deferred revenue	639.9	629.1	607.0
Deferred tax liabilities	79.8	72.5	62.5
Total liabilities	3,418.1	3,404.2	3,199.1
Shareholders’ equity:
Total shareholders’ equity	2,879.9	3,060.7	2,872.2
Total liabilities and shareholders’ equity	6,298.0	6,464.9	6,071.3
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	(295.0)	(408.8)	(139.9)
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	(295.0)	(408.8)	(139.9)
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $1,003.1, $949.2 and $915.1, respectively	0.0		0.0
Goodwill	0.0		0.0
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	(4,036.3)	(4,410.7)	(3,970.7)
Intra-entity receivables, net	(4,060.0)	(3,870.0)	(3,882.4)
Other assets	0.0		0.0
Deferred tax assets	0.0		0.0
Retirement benefit asset	0.0		0.0
Total assets	(8,391.3)	(8,689.5)	(7,993.0)
Current liabilities:
Loans and overdrafts	0.0	0.0	0.0
Accounts payable	0.0	0.0	0.0
Intra-entity payables, net	(295.0)	(408.8)	(139.9)
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	(295.0)	(408.8)	(139.9)
Non-current liabilities:
Intra-entity payables, net	(4,060.0)	(3,870.0)	(3,882.4)
Other liabilities			0.0
Deferred revenue			0.0
Deferred tax liabilities		0.0	0.0
Total liabilities	(4,355.0)	(4,278.8)	(4,022.3)
Shareholders’ equity:
Total shareholders’ equity	(4,036.3)	(4,410.7)	(3,970.7)
Total liabilities and shareholders’ equity	(8,391.3)	(8,689.5)	(7,993.0)
Signet Jewelers Limited | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.2	1.9	0.2	2.1
Accounts receivable, net	0.0	0.0	0.0
Intra-entity receivables, net	74.0	28.7	10.0
Other receivables	0.0	0.0	0.0
Other current assets	0.1	0.1	0.1
Income taxes	0.0	0.0	0.0
Inventories	0.0	0.0	0.0
Total current assets	74.3	30.7	10.3
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $1,003.1, $949.2 and $915.1, respectively	0.0		0.0
Goodwill	0.0		0.0
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	2,835.5	3,047.8	2,879.9
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	2,909.8	3,078.5	2,890.2
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	29.9	17.8	18.0
Deferred revenue	0.0	0.0	0.0
Income taxes	0.0	0.0	0.0
Total current liabilities	29.9	17.8	18.0
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	29.9	17.8	18.0
Shareholders’ equity:
Total shareholders’ equity	2,879.9	3,060.7	2,872.2
Total liabilities and shareholders’ equity	2,909.8	3,078.5	2,890.2
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	0.0	0.2	0.0
Inventories	0.0	0.0	0.0
Total current assets	0.1	0.3	0.1
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $1,003.1, $949.2 and $915.1, respectively	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	402.8	402.6	402.5
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	402.9	402.9	402.6
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	2.4	2.4	2.4
Deferred revenue	0.0	0.0	0.0
Income taxes	(0.1)	0.0	(0.1)
Total current liabilities	1.6	1.7	1.6
Non-current liabilities:
Long-term debt	393.9	393.5	393.0
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	395.5	395.2	394.6
Shareholders’ equity:
Total shareholders’ equity	7.4	7.7	8.0
Total liabilities and shareholders’ equity	402.9	402.9	402.6
Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	83.8	102.0	143.0	166.5
Accounts receivable, net	1,648.5	1,753.0	1,490.4
Intra-entity receivables, net	0.0	0.0	0.0
Other receivables	46.3	68.8	45.1
Other current assets	146.7	144.2	119.6
Income taxes	1.4	2.3	3.0
Inventories	2,342.5	2,372.7	2,318.9
Total current assets	4,269.2	4,443.0	4,120.0
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $1,003.1, $949.2 and $915.1, respectively	734.6	722.3	679.5
Goodwill	514.5	511.9	514.0
Intangible assets, net	424.7	427.8	437.8
Investment in subsidiaries	675.2	762.9	554.9
Intra-entity receivables, net	0.0		0.0
Other assets	127.4	124.5	110.1
Deferred tax assets			2.7
Retirement benefit asset	49.8	51.3	40.4
Total assets	6,795.4	7,043.7	6,459.4
Current liabilities:
Loans and overdrafts	239.3	58.4	80.9
Accounts payable	192.5	260.3	187.5
Intra-entity payables, net	295.0	408.8	139.9
Accrued expenses and other current liabilities	371.5	467.0	422.2
Deferred revenue	254.5	260.3	230.2
Income taxes	38.4	68.4	6.5
Total current liabilities	1,391.2	1,523.2	1,067.2
Non-current liabilities:
Long-term debt	336.6	327.5	347.1
Intra-entity payables, net	4,060.0	3,870.0	3,882.4
Other liabilities	217.3	223.6	218.7
Deferred revenue	639.9	629.1	607.0
Deferred tax liabilities	80.0	73.0	62.5
Total liabilities	6,725.0	6,646.4	6,184.9
Shareholders’ equity:
Total shareholders’ equity	70.4	397.3	274.5
Total liabilities and shareholders’ equity	6,795.4	7,043.7	6,459.4
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	34.6	33.7	16.5	$ 24.9
Accounts receivable, net	2.1	3.4	2.8
Intra-entity receivables, net	221.0	380.1	129.9
Other receivables	20.6	15.2	10.1
Other current assets	5.2	8.3	5.3
Income taxes	0.0	1.0	0.0
Inventories	75.8	81.2	95.3
Total current assets	359.3	522.9	259.9
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $1,003.1, $949.2 and $915.1, respectively	4.9	5.3	5.6
Goodwill	3.6	3.6	3.6
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	525.6	600.0	535.9
Intra-entity receivables, net	3,657.2	3,467.4	3,479.9
Other assets	30.6	30.1	26.7
Deferred tax assets			0.5
Retirement benefit asset	0.0		0.0
Total assets	4,581.2	4,629.3	4,312.1
Current liabilities:
Loans and overdrafts	0.0	0.0	0.0
Accounts payable	2.6	8.8	6.5
Intra-entity payables, net	0.0	0.0	0.0
Accrued expenses and other current liabilities	13.8	11.1	10.5
Deferred revenue	0.0	0.0	0.0
Income taxes		(2.7)	(0.6)
Total current liabilities	16.4	17.2	16.4
Non-current liabilities:
Long-term debt	600.0	600.0	600.0
Intra-entity payables, net			0.0
Other liabilities	6.5	6.9	7.5
Deferred revenue			0.0
Deferred tax liabilities	(0.2)	(0.5)	0.0
Total liabilities	622.7	623.6	623.9
Shareholders’ equity:
Total shareholders’ equity	3,958.5	4,005.7	3,688.2
Total liabilities and shareholders’ equity	$ 4,581.2	$ 4,629.3	$ 4,312.1