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REVENUE (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 100.00% 100.00% 100.00% 100.00%
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage Of Company-Wide Revenue 100.00% 100.00% 100.00% 100.00%
Service Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Percent of Total Company Revenue 1.00% 1.00% 1.00% 1.00%
Contractors [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 10.00% 10.00% 10.00% 10.00%
Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 10.00% 10.00% 10.00% 9.00%
Government Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 15.00% 18.00% 15.00% 16.00%
Healthcare Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 6.00% 6.00% 6.00% 7.00%
Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 29.00% 28.00% 29.00% 29.00%
Retail/Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 10.00% 9.00% 10.00% 9.00%
Transportation [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 5.00% 5.00% 5.00% 5.00%
Others [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 15.00% 14.00% 15.00% 15.00%
High-Touch Solutions N.A        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 100.00% 100.00% 100.00% 100.00%
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage Of Company-Wide Revenue 79.00% 79.00% 78.00% 78.00%
High-Touch Solutions N.A | Contractors [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 9.00% 8.00% 9.00% 9.00%
High-Touch Solutions N.A | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 9.00% 9.00% 9.00% 9.00%
High-Touch Solutions N.A | Government Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 18.00% 22.00% 19.00% 20.00%
High-Touch Solutions N.A | Healthcare Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 7.00% 8.00% 7.00% 9.00%
High-Touch Solutions N.A | Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 29.00% 27.00% 30.00% 28.00%
High-Touch Solutions N.A | Retail/Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 9.00% 9.00% 9.00% 9.00%
High-Touch Solutions N.A | Transportation [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 5.00% 5.00% 5.00% 5.00%
High-Touch Solutions N.A | Others [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 14.00% 12.00% 12.00% 11.00%
Endless Assortment        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 100.00% 100.00% 100.00% 100.00%
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage Of Company-Wide Revenue 19.00% 19.00% 20.00% 18.00%
Endless Assortment | Contractors [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 15.00% 15.00% 15.00% 15.00%
Endless Assortment | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 15.00% 15.00% 15.00% 15.00%
Endless Assortment | Government Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 3.00% 3.00% 3.00% 3.00%
Endless Assortment | Healthcare Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 2.00% 2.00% 2.00% 2.00%
Endless Assortment | Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 30.00% 27.00% 29.00% 29.00%
Endless Assortment | Retail/Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 10.00% 10.00% 10.00% 10.00%
Endless Assortment | Transportation [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 3.00% 3.00% 3.00% 3.00%
Endless Assortment | Others [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 22.00% 25.00% 23.00% 23.00%
Other        
Disaggregation of Revenue [Line Items]        
Percent of Total Company Revenue 2.00% 2.00% 2.00% 4.00%