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Property and Equipment
 9 Months Ended
Oct. 27, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment
 
Property and equipment consisted of the following (dollars in thousands):
 
Estimated Useful Lives (Years)
 
October 27, 2018
 
January 27, 2018
 Land
—
 
$
4,359

 
$
3,470

 Buildings
10-35
 
13,321

 
12,315

 Leasehold improvements
1-10
 
16,326

 
14,202

 Vehicles
1-5
 
573,751

 
536,379

 Computer hardware and software
1-7
 
133,286

 
117,058

 Office furniture and equipment
1-10
 
12,604

 
11,686

 Equipment and machinery
1-10
 
292,049

 
273,712

 Total
 
 
1,045,696

 
968,822

 Less: accumulated depreciation
 
 
(617,391
)
 
(554,054
)
 Property and equipment, net
 
 
$
428,305

 
$
414,768



Depreciation expense was $39.8 million and $36.4 million for the three months ended October 27, 2018 and October 28, 2017, respectively, and $116.5 million and $101.5 million for the nine months ended October 27, 2018 and October 28, 2017, respectively.