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Property and Equipment, Net
 12 Months Ended
Jul. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
4 — Property and Equipment, Net

Property and equipment, net consisted of the following:
 
 
July 31,
(In thousands)
 
2018
 
2017
Transportation and other equipment
 
$
190,900

 
$
120,420

Office furniture and equipment
 
58,477

 
51,778

Software
 
30,680

 
38,501

Land
 
762,524

 
629,826

Buildings and leasehold improvements
 
610,964

 
555,525

 
 
1,653,545

 
1,396,050

Less: Accumulated depreciation and amortization
 
(490,120
)
 
(451,994
)
Property and equipment, net
 
$
1,163,425

 
$
944,056



Depreciation expense on property and equipment was $58.8 million, $39.6 million and $34.2 million for the years ended July 31, 2018, 2017 and 2016, respectively. Amortization expense of software was $5.7 million, $10.6 million and $8.5 million for the years ended July 31, 2018, 2017 and 2016, respectively. During the year ended July 31, 2018 and 2016, the Company retired fully amortized capitalized software of $15.5 million and $29.8 million, respectively, which were no longer being utilized. Additionally, during the year ended July 31, 2017, the Company recognized a $19.4 million charge primarily related to fully impairing costs previously capitalized in connection with the development of business operating software.