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Property and Equipment, Net | 3 Months Ended
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Apr. 30, 2018
Property, Plant and Equipment [Abstract] |
Property and Equipment, Net | Property and Equipment, Net Property and equipment, net consisted of the following (in thousands):
| April 30, 2018 |  | January 31, 2018
Land | $ | 9,641 |  |  | $ | 8,451 |
Buildings | 302,542 |  |  | 255,093 |
Computers, equipment, and software | 440,660 |  |  | 411,177 |
Computers, equipment, and software acquired under capital leases | 13,414 |  |  | 13,848 |
Furniture and fixtures | 36,956 |  |  | 34,809 |
Leasehold improvements | 142,343 |  |  | 132,209 |
Property and equipment, gross (1) | 945,556 |  |  | 855,587 |
Less accumulated depreciation and amortization | (334,263 | ) |  | (308,978 | )
Property and equipment, net | $ | 611,293 |  |  | $ | 546,609 |
(1) | Property and equipment, gross includes construction-in-progress for owned real estate projects of $199 million and $177 million that have not yet been placed in service as of April 30, 2018 and January 31, 2018, respectively.
Depreciation expense totaled $33 million and $27 million for the three months ended April 30, 2018 and 2017, respectively. Interest costs capitalized to property and equipment totaled $2 million and $1 million for the three months ended April 30, 2018 and 2017, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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