Condensed consolidating financial information - Condensed consolidated balance sheet (Details) - USD ($) $ in Millions	Apr. 30, 2016	Jan. 30, 2016	May. 02, 2015	Jan. 31, 2015
Current assets:
Cash and cash equivalents	$ 113.0	$ 137.7	$ 122.6	$ 193.6
Accounts receivable, net	1,689.3	1,756.4	1,499.9
Intra-entity receivables, net	0.0	0.0	0.0
Other receivables	63.7	84.0	56.5
Other current assets	161.2	152.6	130.6
Income taxes	1.4	3.5	5.3
Inventories	2,512.6	2,453.9	2,487.8
Total current assets	4,541.2	4,588.1	4,302.7
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $993.6, $949.2 and $848.8, respectively	725.7	727.6	668.7
Goodwill	519.7	515.5	520.7	519.2
Intangible assets, net	430.4	427.8	445.9
Investment in subsidiaries	0.0		0.0
Intra-entity receivables, net	0.0		0.0
Other assets	157.2	154.6	132.1
Deferred tax assets	0.0	0.0	2.2
Retirement benefit asset	53.5	51.3	38.1
Total assets	6,427.7	6,464.9	6,110.4
Current liabilities:
Loans and overdrafts	110.1	57.7	43.0
Accounts payable	255.7	269.1	256.5
Intra-entity payables, net		0.0	0.0
Accrued expenses and other current liabilities	409.5	498.3	420.5
Deferred revenue	261.4	260.3	244.0
Income taxes	19.1	65.7	28.3
Total current liabilities	1,055.8	1,151.1	992.3
Non-current liabilities:
Long-term debt	1,311.5	1,321.0	1,347.2
Intra-entity payables, net			0.0
Other liabilities	229.7	230.5	224.4
Deferred revenue	644.4	629.1	597.3
Deferred tax liabilities	88.1	72.5	57.3
Total liabilities	3,329.5	3,404.2	3,218.5
Shareholders’ equity:
Total shareholders’ equity	3,098.2	3,060.7	2,891.9
Total liabilities and shareholders’ equity	6,427.7	6,464.9	6,110.4
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	(335.0)	(408.8)	(176.2)
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	(335.0)	(408.8)	(176.2)
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $993.6, $949.2 and $848.8, respectively	0.0		0.0
Goodwill	0.0		0.0
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	(4,199.7)	(4,410.7)	(3,888.1)
Intra-entity receivables, net	(4,065.0)	(3,870.0)	(3,892.1)
Other assets	0.0		0.0
Deferred tax assets	0.0		0.0
Retirement benefit asset	0.0		0.0
Total assets	(8,599.7)	(8,689.5)	(7,956.4)
Current liabilities:
Loans and overdrafts	0.0	0.0	0.0
Accounts payable	0.0	0.0	0.0
Intra-entity payables, net	(335.0)	(408.8)	(176.2)
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	(335.0)	(408.8)	(176.2)
Non-current liabilities:
Intra-entity payables, net	(4,065.0)	(3,870.0)	(3,892.1)
Other liabilities			0.0
Deferred revenue			0.0
Deferred tax liabilities		0.0	0.0
Total liabilities	(4,400.0)	(4,278.8)	(4,068.3)
Shareholders’ equity:
Total shareholders’ equity	(4,199.7)	(4,410.7)	(3,888.1)
Total liabilities and shareholders’ equity	(8,599.7)	(8,689.5)	(7,956.4)
Signet Jewelers Limited | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.6	1.9	0.9	2.1
Accounts receivable, net	0.0	0.0	0.0
Intra-entity receivables, net	133.0	28.7	85.9
Other receivables	0.0	0.0	0.0
Other current assets	0.1	0.1	0.4
Income taxes	0.0	0.0	0.0
Inventories	0.0	0.0	0.0
Total current assets	133.7	30.7	87.2
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $993.6, $949.2 and $848.8, respectively	0.0		0.0
Goodwill	0.0		0.0
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	2,985.1	3,047.8	2,822.7
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	3,118.8	3,078.5	2,909.9
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	20.6	17.8	18.0
Deferred revenue	0.0	0.0	0.0
Income taxes	0.0	0.0	0.0
Total current liabilities	20.6	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	20.6	17.8	18.0
Shareholders’ equity:
Total shareholders’ equity	3,098.2	3,060.7	2,891.9
Total liabilities and shareholders’ equity	3,118.8	3,078.5	2,909.9
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 $993.6, $949.2 and $848.8, 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	407.5	402.6	407.3
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	407.6	402.9	407.4
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	0.0
Total current liabilities	6.4	1.7	6.4
Non-current liabilities:
Long-term debt	393.7	393.5	392.9
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	400.1	395.2	399.3
Shareholders’ equity:
Total shareholders’ equity	7.5	7.7	8.1
Total liabilities and shareholders’ equity	407.6	402.9	407.4
Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	87.6	102.0	110.4	166.5
Accounts receivable, net	1,685.1	1,753.0	1,498.3
Intra-entity receivables, net	0.0	0.0	0.0
Other receivables	44.9	68.8	45.4
Other current assets	155.8	144.2	124.9
Income taxes	1.4	2.3	5.3
Inventories	2,433.9	2,372.7	2,407.2
Total current assets	4,408.7	4,443.0	4,191.5
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $993.6, $949.2 and $848.8, respectively	720.5	722.3	663.2
Goodwill	516.1	511.9	517.1
Intangible assets, net	430.4	427.8	445.9
Investment in subsidiaries	687.4	762.9	541.5
Intra-entity receivables, net	0.0		0.0
Other assets	127.0	124.5	106.1
Deferred tax assets			1.8
Retirement benefit asset	53.5	51.3	38.1
Total assets	6,943.6	7,043.7	6,505.2
Current liabilities:
Loans and overdrafts	110.8	58.4	43.7
Accounts payable	248.3	260.3	252.2
Intra-entity payables, net	335.0	408.8	176.2
Accrued expenses and other current liabilities	369.0	467.0	386.7
Deferred revenue	261.4	260.3	244.0
Income taxes	22.6	68.4	28.2
Total current liabilities	1,347.1	1,523.2	1,131.0
Non-current liabilities:
Long-term debt	317.8	327.5	354.3
Intra-entity payables, net	4,065.0	3,870.0	3,892.1
Other liabilities	223.5	223.6	216.8
Deferred revenue	644.4	629.1	597.3
Deferred tax liabilities	88.3	73.0	57.3
Total liabilities	6,686.1	6,646.4	6,248.8
Shareholders’ equity:
Total shareholders’ equity	257.5	397.3	256.4
Total liabilities and shareholders’ equity	6,943.6	7,043.7	6,505.2
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	24.7	33.7	11.2	$ 24.9
Accounts receivable, net	4.2	3.4	1.6
Intra-entity receivables, net	202.0	380.1	90.3
Other receivables	18.8	15.2	11.1
Other current assets	5.3	8.3	5.3
Income taxes	0.0	1.0	0.0
Inventories	78.7	81.2	80.6
Total current assets	333.7	522.9	200.1
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $993.6, $949.2 and $848.8, respectively	5.2	5.3	5.5
Goodwill	3.6	3.6	3.6
Intangible assets, net	0.0	0.0	0.0
Investment in subsidiaries	527.2	600.0	523.9
Intra-entity receivables, net	3,657.5	3,467.4	3,484.8
Other assets	30.2	30.1	26.0
Deferred tax assets			0.4
Retirement benefit asset	0.0		0.0
Total assets	4,557.4	4,629.3	4,244.3
Current liabilities:
Loans and overdrafts	0.0	0.0	0.0
Accounts payable	7.4	8.8	4.3
Intra-entity payables, net	0.0	0.0	0.0
Accrued expenses and other current liabilities	12.8	11.1	8.7
Deferred revenue	0.0	0.0	0.0
Income taxes	(3.5)	(2.7)	0.1
Total current liabilities	16.7	17.2	13.1
Non-current liabilities:
Long-term debt	600.0	600.0	600.0
Intra-entity payables, net			0.0
Other liabilities	6.2	6.9	7.6
Deferred revenue			0.0
Deferred tax liabilities	(0.2)	(0.5)	0.0
Total liabilities	622.7	623.6	620.7
Shareholders’ equity:
Total shareholders’ equity	3,934.7	4,005.7	3,623.6
Total liabilities and shareholders’ equity	$ 4,557.4	$ 4,629.3	$ 4,244.3