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Receivables and Revenue Recognition (Tables)
 6 Months Ended
Jul. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following table disaggregates the Company's net sales by major source:
 
Three Months Ended July 31,
 
Six Months Ended July 31,
(in millions)
2018
 
2017
 
2018
 
2017
Net sales*:
 
 
 
 
 
 
 
Jewelry collections
$
574.6

 
$
485.5

 
$
1,103.7

 
$
935.3

Engagement jewelry
282.2

 
260.1

 
576.9

 
524.9

Designer jewelry
128.1

 
121.9

 
256.4

 
237.2

All other
91.0

 
92.2

 
172.1

 
161.9

 
$
1,075.9

 
$
959.7

 
$
2,109.1

 
$
1,859.3


*Certain reclassifications within the jewelry categories have been made to the prior year amounts to conform to the current year category presentation.