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Revenue Recognition (Tables)
 3 Months Ended
Apr. 30, 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 months ended April 30, 2018 and 2017 (as a percent of consolidated net sales):
 
Three months ended April 30,
 
2018
 
2017
Apple, Inc.
14%
 
16%
HP Inc.
12%
 
12%
Cisco Systems, Inc.
11%
 
11%