Condensed consolidating financial information - Condensed consolidated balance sheet (Details) (USD $) In Millions, unless otherwise specified	May 02, 2015	Jan. 31, 2015	May 03, 2014	Feb. 01, 2014
Current assets:
Cash and cash equivalents	$ 122.6	$ 193.6	$ 249.1	$ 247.6
Accounts receivable, net	1,499.9us-gaap_AccountsReceivableNetCurrent	1,567.6us-gaap_AccountsReceivableNetCurrent	1,308.2us-gaap_AccountsReceivableNetCurrent
Intra-entity receivables, net	0us-gaap_DueFromRelatedPartiesCurrent	0us-gaap_DueFromRelatedPartiesCurrent	0us-gaap_DueFromRelatedPartiesCurrent
Other receivables	56.5us-gaap_OtherReceivables	63.6us-gaap_OtherReceivables	47.1us-gaap_OtherReceivables
Other current assets	132.4us-gaap_OtherAssetsCurrent	137.2us-gaap_OtherAssetsCurrent	91.0us-gaap_OtherAssetsCurrent
Deferred tax assets	5.7us-gaap_DeferredTaxAssetsNetCurrent	4.5us-gaap_DeferredTaxAssetsNetCurrent	2.7us-gaap_DeferredTaxAssetsNetCurrent
Income taxes	5.3us-gaap_IncomeTaxesReceivable	1.8us-gaap_IncomeTaxesReceivable	10.7us-gaap_IncomeTaxesReceivable
Inventories	2,487.8us-gaap_InventoryNet	2,439.0us-gaap_InventoryNet	1,523.9us-gaap_InventoryNet
Total current assets	4,310.2us-gaap_AssetsCurrent	4,407.3us-gaap_AssetsCurrent	3,232.7us-gaap_AssetsCurrent
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $848.8, $852.1 and $816.3, respectively	668.7us-gaap_PropertyPlantAndEquipmentNet	665.9us-gaap_PropertyPlantAndEquipmentNet	494.0us-gaap_PropertyPlantAndEquipmentNet
Goodwill	520.7us-gaap_Goodwill	519.2us-gaap_Goodwill	26.8us-gaap_Goodwill	26.8us-gaap_Goodwill
Intangible assets, net	445.9	447.1	0
Investment in subsidiaries	0		0
Intra-entity receivables, net	0us-gaap_DueFromRelatedPartiesNoncurrent		0us-gaap_DueFromRelatedPartiesNoncurrent
Other assets	141.1us-gaap_OtherAssetsNoncurrent	140.0us-gaap_OtherAssetsNoncurrent	93.5us-gaap_OtherAssetsNoncurrent
Deferred tax assets	119.9us-gaap_DeferredTaxAssetsNetNoncurrent	111.1us-gaap_DeferredTaxAssetsNetNoncurrent	114.8us-gaap_DeferredTaxAssetsNetNoncurrent
Retirement benefit asset	38.1	37.0	59.8
Total assets	6,244.6us-gaap_Assets	6,327.6us-gaap_Assets	4,021.6us-gaap_Assets
Current liabilities:
Loans and overdrafts	44.8us-gaap_ShortTermBorrowings	97.5us-gaap_ShortTermBorrowings	8.8us-gaap_ShortTermBorrowings
Accounts payable	256.5us-gaap_AccountsPayableCurrent	277.7us-gaap_AccountsPayableCurrent	163.1us-gaap_AccountsPayableCurrent
Intra-entity payables, net		0us-gaap_DueToRelatedPartiesCurrent	0us-gaap_DueToRelatedPartiesCurrent
Accrued expenses and other current liabilities	420.5	482.4	293.8
Deferred revenue	244.0us-gaap_DeferredRevenueCurrent	248.0us-gaap_DeferredRevenueCurrent	174.4us-gaap_DeferredRevenueCurrent
Deferred tax liabilities	158.9us-gaap_DeferredTaxLiabilitiesCurrent	145.8us-gaap_DeferredTaxLiabilitiesCurrent	123.9us-gaap_DeferredTaxLiabilitiesCurrent
Income taxes	28.3us-gaap_TaxesPayableCurrent	86.9us-gaap_TaxesPayableCurrent	32.2us-gaap_TaxesPayableCurrent
Total current liabilities	1,153.0us-gaap_LiabilitiesCurrent	1,338.3us-gaap_LiabilitiesCurrent	796.2us-gaap_LiabilitiesCurrent
Non-current liabilities:
Long-term debt	1,356.2us-gaap_LongTermDebtNoncurrent	1,363.8us-gaap_LongTermDebtNoncurrent	0us-gaap_LongTermDebtNoncurrent
Intra-entity payables, net			0us-gaap_DueToRelatedPartiesNoncurrent
Other liabilities	224.4us-gaap_OtherLiabilitiesNoncurrent	230.2us-gaap_OtherLiabilitiesNoncurrent	121.6us-gaap_OtherLiabilitiesNoncurrent
Deferred revenue	597.3us-gaap_DeferredRevenueNoncurrent	563.9us-gaap_DeferredRevenueNoncurrent	457.3us-gaap_DeferredRevenueNoncurrent
Deferred tax liabilities	21.8	21.0	2.7
Total liabilities	3,352.7us-gaap_Liabilities	3,517.2us-gaap_Liabilities	1,377.8us-gaap_Liabilities
Shareholders’ equity:
Total shareholders’ equity	2,891.9us-gaap_StockholdersEquity	2,810.4us-gaap_StockholdersEquity	2,643.8us-gaap_StockholdersEquity
Total liabilities and shareholders’ equity	6,244.6	6,327.6	4,021.6
Consolidation, Eliminations
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0	0
Intra-entity receivables, net	(176.2)	(183.4)	(257.8)
Other receivables	0	0	0
Other current assets	0	0	0
Deferred tax assets	0	0	0
Income taxes	0	0	0
Inventories	0	0	0
Total current assets	(176.2)	(183.4)	(257.8)
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $848.8, $852.1 and $816.3, respectively	0		0
Goodwill	0		0
Intangible assets, net	0	0
Investment in subsidiaries	(3,888.1)	(3,585.8)	(5,437.8)
Intra-entity receivables, net	(3,892.1)	(3,892.4)	(1,098.0)
Other assets	0		0
Deferred tax assets	0		0
Retirement benefit asset	0		0
Total assets	(7,956.4)	(7,661.6)	(6,793.6)
Current liabilities:
Loans and overdrafts	0	0	0
Accounts payable	0	0	0
Intra-entity payables, net	(176.2)	(183.4)	(257.8)
Accrued expenses and other current liabilities	0	0	0
Deferred revenue	0	0	0
Deferred tax liabilities	0	0	0
Income taxes	0	0	0
Total current liabilities	(176.2)	(183.4)	(257.8)
Non-current liabilities:
Intra-entity payables, net	(3,892.1)	(3,892.4)	(1,098.0)
Other liabilities			0
Deferred revenue			0
Deferred tax liabilities		0	0
Total liabilities	(4,068.3)	(4,075.8)	(1,355.8)
Shareholders’ equity:
Total shareholders’ equity	(3,888.1)	(3,585.8)	(5,437.8)
Total liabilities and shareholders’ equity	(7,956.4)	(7,661.6)	(6,793.6)
Signet Jewelers Limited \| Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.9	2.1	1.7	1.4
Accounts receivable, net	0	0	0
Intra-entity receivables, net	85.9	121.6	24.3
Other receivables	0	0	0
Other current assets	0.4	0.1	0.1
Deferred tax assets	0	0	0
Income taxes	0	0	0
Inventories	0	0	0
Total current assets	87.2	123.8	26.1
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $848.8, $852.1 and $816.3, respectively	0		0
Goodwill	0		0
Intangible assets, net	0	0
Investment in subsidiaries	2,822.7	2,701.3	2,634.0
Intra-entity receivables, net	0		0
Other assets	0		0
Deferred tax assets	0		0
Retirement benefit asset	0		0
Total assets	2,909.9	2,825.1	2,660.1
Current liabilities:
Loans and overdrafts	0	0	0
Accounts payable	0	0	0
Intra-entity payables, net	0	0	0
Accrued expenses and other current liabilities	18.0	14.7	16.3
Deferred revenue	0	0	0
Deferred tax liabilities	0	0	0
Income taxes	0	0	0
Total current liabilities	18.0	14.7	16.3
Non-current liabilities:
Intra-entity payables, net			0
Other liabilities			0
Deferred revenue			0
Deferred tax liabilities		0	0
Total liabilities	18.0	14.7	16.3
Shareholders’ equity:
Total shareholders’ equity	2,891.9	2,810.4	2,643.8
Total liabilities and shareholders’ equity	2,909.9	2,825.1	2,660.1
Signet UK Finance plc \| Reportable Legal Entities
Current assets:
Cash and cash equivalents	0.1	0.1	0	0
Accounts receivable, net	0	0	0
Intra-entity receivables, net	0	0	0
Other receivables	0	0	0
Other current assets	0.7	0.7	0
Deferred tax assets	0	0	0
Income taxes	0	0	0
Inventories	0	0	0
Total current assets	0.8	0.8	0
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $848.8, $852.1 and $816.3, respectively	0	0	0
Goodwill	0	0	0
Intangible assets, net	0	0
Investment in subsidiaries	0	0	0
Intra-entity receivables, net	407.3	402.4	0
Other assets	5.6	5.8	0
Deferred tax assets	0	0	0
Retirement benefit asset	0	0	0
Total assets	413.7	409.0	0
Current liabilities:
Loans and overdrafts	0	0	0
Accounts payable	0	0	0
Intra-entity payables, net	0	0	0
Accrued expenses and other current liabilities	7.1	2.4	0
Deferred revenue	0	0	0
Deferred tax liabilities	0	0	0
Income taxes		(0.2)	0
Total current liabilities	7.1	2.2	0
Non-current liabilities:
Long-term debt	398.5	398.5
Intra-entity payables, net		0	0
Other liabilities		0	0
Deferred revenue		0	0
Deferred tax liabilities		0	0
Total liabilities	405.6	400.7	0
Shareholders’ equity:
Total shareholders’ equity	8.1	8.3	0
Total liabilities and shareholders’ equity	413.7	409.0	0
Guarantor Subsidiaries \| Reportable Legal Entities
Current assets:
Cash and cash equivalents	110.4	166.5	226.7	237.0
Accounts receivable, net	1,498.3	1,566.2	1,299.4
Intra-entity receivables, net	0	0	0
Other receivables	45.4	53.9	46.0
Other current assets	126.0	130.9	90.5
Deferred tax assets	5.4	4.3	2.5
Income taxes	5.3	1.8	10.1
Inventories	2,407.2	2,376.6	1,469.4
Total current assets	4,198.0	4,300.2	3,144.6
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $848.8, $852.1 and $816.3, respectively	663.2	660.2	487.8
Goodwill	517.1	515.6	23.2
Intangible assets, net	445.9	447.1
Investment in subsidiaries	541.5	462.8	1,559.9
Intra-entity receivables, net	0		0
Other assets	109.5	105.3	93.5
Deferred tax assets	119.8	111.0	114.8
Retirement benefit asset	38.1	37.0	59.8
Total assets	6,633.1	6,639.2	5,483.6
Current liabilities:
Loans and overdrafts	44.8	97.5	8.8
Accounts payable	252.2	273.4	162.9
Intra-entity payables, net	176.2	183.4	257.8
Accrued expenses and other current liabilities	386.7	456.7	274.2
Deferred revenue	244.0	248.0	174.4
Deferred tax liabilities	158.9	145.8	123.9
Income taxes	28.2	87.7	35.7
Total current liabilities	1,291.0	1,492.5	1,037.7
Non-current liabilities:
Long-term debt	357.7	365.3
Intra-entity payables, net	3,892.1	3,892.4	1,098.0
Other liabilities	216.8	222.0	118.5
Deferred revenue	597.3	563.9	457.3
Deferred tax liabilities	21.8	21.0	2.7
Total liabilities	6,376.7	6,557.1	2,714.2
Shareholders’ equity:
Total shareholders’ equity	256.4	82.1	2,769.4
Total liabilities and shareholders’ equity	6,633.1	6,639.2	5,483.6
Non-Guarantor Subsidiaries \| Reportable Legal Entities
Current assets:
Cash and cash equivalents	11.2	24.9	20.7	9.2
Accounts receivable, net	1.6	1.4	8.8
Intra-entity receivables, net	90.3	61.8	233.5
Other receivables	11.1	9.7	1.1
Other current assets	5.3	5.5	0.4
Deferred tax assets	0.3	0.2	0.2
Income taxes	0		0.6
Inventories	80.6	62.4	54.5
Total current assets	200.4	165.9	319.8
Non-current assets:
Property, plant and equipment, net of accumulated depreciation of $848.8, $852.1 and $816.3, respectively	5.5	5.7	6.2
Goodwill	3.6	3.6	3.6
Intangible assets, net	0	0
Investment in subsidiaries	523.9	421.7	1,243.9
Intra-entity receivables, net	3,484.8	3,490.0	1,098.0
Other assets	26.0	28.9	0
Deferred tax assets	0.1	0.1	0
Retirement benefit asset	0		0
Total assets	4,244.3	4,115.9	2,671.5
Current liabilities:
Loans and overdrafts	0	0	0
Accounts payable	4.3	4.3	0.2
Intra-entity payables, net	0	0	0
Accrued expenses and other current liabilities	8.7	8.6	3.3
Deferred revenue	0	0	0
Deferred tax liabilities	0	0	0
Income taxes	0.1	(0.6)	(3.5)
Total current liabilities	13.1	12.3	0
Non-current liabilities:
Long-term debt	600.0	600.0
Intra-entity payables, net			0
Other liabilities	7.6	8.2	3.1
Deferred revenue			0
Deferred tax liabilities		0	0
Total liabilities	620.7	620.5	3.1
Shareholders’ equity:
Total shareholders’ equity	3,623.6	3,495.4	2,668.4
Total liabilities and shareholders’ equity	$ 4,244.3	$ 4,115.9	$ 2,671.5

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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