Receivables and Revenue Recognition - Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2018	Apr. 30, 2017
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 17.0
Net sales	1,033.2	$ 899.6
Jewelry collections [Member]
Disaggregation of Revenue [Line Items]
Net sales	529.3	449.9
Engagement jewelry [Member]
Disaggregation of Revenue [Line Items]
Net sales	294.5	264.6
Designer jewelry [Member]
Disaggregation of Revenue [Line Items]
Net sales	128.4	115.4
Other products/services [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 81.0	$ 69.7

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

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- Definition

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+ References

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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