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Property and Equipment, Net
 9 Months Ended
Oct. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
Property and Equipment, Net
Property and equipment, net consisted of the following (in thousands):
 
October 31, 2018
 
January 31, 2018
Land
$
18,593

 
$
8,451

Buildings
389,320

 
255,093

Computers, equipment, and software
510,677

 
425,025

Furniture and fixtures
36,557

 
34,809

Leasehold improvements
154,108

 
132,209

Property and equipment, gross (1)
1,109,255

 
855,587

Less accumulated depreciation and amortization
(373,812
)
 
(308,978
)
Property and equipment, net
$
735,443

 
$
546,609


(1)  
Property and equipment, gross included construction-in-progress for owned real estate projects of $297 million and $177 million that had not yet been placed in service as of October 31, 2018 and January 31, 2018, respectively.
Depreciation expense totaled $38 million and $30 million for the three months ended October 31, 2018 and 2017, respectively, and $107 million and $85 million for the nine months ended October 31, 2018 and 2017, respectively. Interest costs capitalized to property and equipment totaled $3 million for each of the three month periods ended October 31, 2018 and 2017, and $7 million and $6 million for the nine months ended October 31, 2018 and 2017, respectively.