Segment Information - Summary of Activity by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Segment Reporting Information [Line Items]
Sales	$ 6,550.2	$ 5,736.3	$ 4,209.2
Operating income (loss)	703.7	576.6	570.5
Depreciation and amortization	175.3	149.7	110.2
Total assets	6,474.4	6,214.3
Total liabilities	3,413.7	3,403.9
Diamonds and diamond jewelry
Segment Reporting Information [Line Items]
Sales	3,918.1	3,450.6	2,552.1
Gold, silver jewelry, other products and services
Segment Reporting Information [Line Items]
Sales	2,116.4	1,784.5	1,236.9
Watches
Segment Reporting Information [Line Items]
Sales	515.7	501.2	420.2
Operating Segments
Segment Reporting Information [Line Items]
Sales	6,550.2	5,736.3	4,209.2
Operating income (loss)	703.7	576.6	570.5
Depreciation and amortization	175.3	149.7	110.2
Capital additions	226.5	220.2	152.7
Total assets	6,474.4	6,214.3
Total long-lived assets	1,670.9	1,632.2
Total liabilities	3,413.7	3,403.9
Sterling Jewelers | Operating Segments
Segment Reporting Information [Line Items]
Sales	3,988.7	3,765.0	3,517.6
Operating income (loss)	718.6	624.3	553.2
Depreciation and amortization	106.2	95.7	88.8
Capital additions	141.6	157.6	134.2
Total assets	3,788.0	3,505.0
Total long-lived assets	519.7	488.3
Total liabilities	1,982.2	1,880.6
Zale Jewelry | Operating Segments
Segment Reporting Information [Line Items]
Sales	1,568.2	1,068.7
Operating income (loss)	44.3	(1.9)
Depreciation and amortization	44.8	29.4
Capital additions	47.7	35.1
Impact of purchase accounting adjustments on operating income loss	(23.1)	(35.1)
Total assets	1,955.1	1,932.6
Total long-lived assets	1,013.7	1,014.4
Total liabilities	530.3	543.6
Zale Jewelry | Operating Segments | CANADA
Segment Reporting Information [Line Items]
Sales	248.7	205.5
Piercing Pagoda | Operating Segments
Segment Reporting Information [Line Items]
Sales	243.2	146.9
Operating income (loss)	7.8	(6.3)
Depreciation and amortization	3.3	1.6
Capital additions	10.2	6.9
Impact of purchase accounting adjustments on operating income loss	(3.3)	(10.8)
Total assets	141.8	132.8
Total long-lived assets	53.3	46.5
Total liabilities	28.5	47.1
UK Jewelry | Operating Segments
Segment Reporting Information [Line Items]
Sales	737.6	743.6	685.6
Operating income (loss)	61.5	52.2	42.4
Depreciation and amortization	20.1	22.1	21.4
Capital additions	26.4	20.2	18.4
Total assets	427.8	413.5
Total long-lived assets	75.3	73.8
Total liabilities	132.0	128.1
Other | Operating Segments
Segment Reporting Information [Line Items]
Sales	12.5	12.1	6.0
Operating income (loss)	(128.5)	(91.7)	(25.1)
Depreciation and amortization	0.9	0.9	0.0
Capital additions	0.6	0.4	$ 0.1
Acquisition integration and severance related costs	78.9	59.8
Total assets	161.7	230.4
Total long-lived assets	8.9	9.2
Total liabilities	$ 740.7	$ 804.5