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Revenue Recognition (Tables)
 9 Months Ended
Oct. 31, 2018
Revenue Recognition [Abstract]  
Concentration Risk
The following table provides a comparison of sales generated from products purchased from vendors that exceeded 10% of the Company's consolidated net sales for the three and nine months ended October 31, 2018 and 2017 (as a percent of consolidated net sales):
 
Three months ended October 31,
 
Nine months ended October 31,
 
2018
 
2017
 
2018
 
2017
Apple, Inc.
17%
 
18%
 
15%
 
16%
HP Inc.
11%
 
11%
 
11%
 
11%
Cisco Systems, Inc.
10%
 
11%
 
11%
 
11%