Condensed Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Nov. 01, 2014	Aug. 02, 2014	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	Feb. 02, 2013
Current assets:
Cash and cash equivalents	$ 87.6	$ 215.0	$ 247.6	$ 87.8	$ 212.9	$ 301.0
Accounts receivable, net	1,292.1		1,374.0	1,123.5
Other receivables	56.7		51.5	51.2
Other current assets	133.7		87.0	86.9
Deferred tax assets	1.6		3.0	2.7
Income taxes	21.6		6.5	16.7
Inventories	2,674.6		1,488.0	1,644.9
Total current assets	4,267.9		3,257.6	3,013.7
Non-current assets:
Property, plant and equipment, net	658.8		487.6	471.1
Goodwill	524.3		26.8	23.2		24.6
Intangible assets, net	461.3
Other assets	133.5		114.0	106.7
Deferred tax assets	72.8		113.7	119.9
Retirement benefit asset	59.9		56.3	54.0
Total assets	6,178.5		4,029.2	3,765.4
Current liabilities:
Loans and overdrafts	221.8		19.3	46.0
Accounts payable	396.2		162.9	244.9
Accrued expenses and other current liabilities	422.7		328.5	252.5
Deferred revenue	221.6		173.0	156.3
Deferred tax liabilities	151.2		113.1	136.2
Income taxes	3.6		103.9	6.8
Total current liabilities	1,417.1		900.7	842.7
Non-current liabilities:
Long-term debt	1,371.3
Other liabilities	227.2		121.7	119.3
Deferred revenue	518.8		443.7	416.2
Deferred tax liabilities	1.8			1.0
Total liabilities	3,536.2		1,466.1	1,379.2
Total shareholders' equity	2,642.3		2,563.1	2,386.2
Total liabilities and shareholders' equity	6,178.5		4,029.2	3,765.4
Eliminations
Current assets:
Intercompany receivables, net	(159.3)		(285.7)	(467.6)
Total current assets	(159.3)		(285.7)	(467.6)
Non-current assets:
Investment in subsidiaries	(3,459.5)		(5,122.3)	(5,083.3)
Intercompany receivables, net	(3,733.5)		(1,098.0)	(863.0)
Total assets	(7,352.3)		(6,506.0)	(6,413.9)
Current liabilities:
Intercompany payables, net	(159.3)		(285.7)	(467.6)
Total current liabilities	(159.3)		(285.7)	(467.6)
Non-current liabilities:
Intercompany payables, net	(3,733.5)		(1,098.0)	(863.0)
Total liabilities	(3,892.8)		(1,383.7)	(1,330.6)
Total shareholders' equity	(3,459.5)		(5,122.3)	(5,083.3)
Total liabilities and shareholders' equity	(7,352.3)		(6,506.0)	(6,413.9)
Signet Jewelers Limited
Current assets:
Cash and cash equivalents	2.9	1.4	1.4	3.2	0.9	13.4
Intercompany receivables, net	129.9		47.7	11.7
Other current assets	0.1			0.1
Total current assets	132.9		49.1	15.0
Non-current assets:
Investment in subsidiaries	2,524.2		2,526.3	2,383.4
Total assets	2,657.1		2,575.4	2,398.4
Current liabilities:
Accrued expenses and other current liabilities	14.8		12.3	12.2
Total current liabilities	14.8		12.3	12.2
Non-current liabilities:
Total liabilities	14.8		12.3	12.2
Total shareholders' equity	2,642.3		2,563.1	2,386.2
Total liabilities and shareholders' equity	2,657.1		2,575.4	2,398.4
Signet UK Finance plc
Current assets:
Other current assets	0.7
Total current assets	0.7
Non-current assets:
Intercompany receivables, net	408.5
Other assets	6.0
Total assets	415.2
Current liabilities:
Accrued expenses and other current liabilities	8.4
Income taxes	(0.1)
Total current liabilities	8.3
Non-current liabilities:
Long-term debt	398.4
Total liabilities	406.7
Total shareholders' equity	8.5
Total liabilities and shareholders' equity	415.2
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	74.1	191.1	237.0	65.9	203.1	271.3
Accounts receivable, net	1,281.9		1,361.3	1,114.8
Other receivables	55.0		51.1	50.9
Other current assets	127.1		86.5	86.9
Deferred tax assets	1.4		2.8	2.4
Income taxes	21.0		6.0	16.7
Inventories	2,619.1		1,434.5	1,590.4
Total current assets	4,179.6		3,179.2	2,928.0
Non-current assets:
Property, plant and equipment, net	652.8		481.5	470.3
Goodwill	520.7
Intangible assets, net	461.3
Investment in subsidiaries	484.0		1,452.8	1,498.0
Other assets	100.0		110.4	106.7
Deferred tax assets	72.7		113.6	119.9
Retirement benefit asset	59.9		56.3	54.0
Total assets	6,531.0		5,393.8	5,176.9
Current liabilities:
Loans and overdrafts	221.8		19.3	46.0
Accounts payable	396.0		160.5	242.7
Intercompany payables, net	159.3		285.7	467.6
Accrued expenses and other current liabilities	389.5		313.1	237.8
Deferred revenue	221.6		173.0	156.3
Deferred tax liabilities	151.2		113.1	136.2
Income taxes	(3.8)		101.3	3.2
Total current liabilities	1,535.6		1,166.0	1,289.8
Non-current liabilities:
Long-term debt	372.9
Intercompany payables, net	3,733.5		1,098.0	863.0
Other liabilities	219.1		118.5	116.1
Deferred revenue	518.8		443.7	416.2
Deferred tax liabilities	1.8			1.0
Total liabilities	6,381.7		2,826.2	2,686.1
Total shareholders' equity	149.3		2,567.6	2,490.8
Total liabilities and shareholders' equity	6,531.0		5,393.8	5,176.9
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	10.6	22.5	9.2	18.7	8.9	16.3
Accounts receivable, net	10.2		12.7	8.7
Intercompany receivables, net	29.4		238.0	455.9
Other receivables	1.7		0.4	0.3
Other current assets	5.8		0.5	(0.1)
Deferred tax assets	0.2		0.2	0.3
Income taxes	0.6		0.5
Inventories	55.5		53.5	54.5
Total current assets	114.0		315.0	538.3
Non-current assets:
Property, plant and equipment, net	6.0		6.1	0.8
Goodwill	3.6
Investment in subsidiaries	451.3		1,143.2	1,201.9
Intercompany receivables, net	3,325.0		1,098.0	863.0
Other assets	27.5		3.6
Deferred tax assets	0.1		0.1
Total assets	3,927.5		2,566.0	2,604.0
Current liabilities:
Accounts payable	0.2		2.4	2.2
Accrued expenses and other current liabilities	10.0		3.1	2.5
Income taxes	7.5		2.6	3.6
Total current liabilities	17.7		8.1	8.3
Non-current liabilities:
Long-term debt	600.0
Other liabilities	8.1		3.2	3.2
Total liabilities	625.8		11.3	11.5
Total shareholders' equity	3,301.7		2,554.7	2,592.5
Total liabilities and shareholders' equity	$ 3,927.5		$ 2,566.0	$ 2,604.0