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PROPERTY AND EQUIPMENT | 12 Months Ended
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Jun. 30, 2018
PROPERTY AND EQUIPMENT |
PROPERTY AND EQUIPMENT | 4. PROPERTY AND EQUIPMENT Property and equipment consisted of the following (in thousands):
|  |  |  | June 30, |
|  | Estimated Useful Lives |
|  | 2017 |  | 2018 |
Land |  | N/A |  | $ | 14,212 |  | $ | 16,569 |
Buildings, civil works and improvements |  | 5-40 years |  |  | 157,123 |  |  | 56,585 |
Leasehold improvements |  | 1-13 years |  |  | 9,025 |  |  | 9,681 |
Equipment and tooling |  | 3-10 years |  |  | 166,991 |  |  | 117,294 |
Furniture and fixtures |  | 3-10 years |  |  | 3,371 |  |  | 3,331 |
Computer equipment |  | 3-5 years |  |  | 17,991 |  |  | 18,759 |
Computer software |  | 3-10 years |  |  | 17,303 |  |  | 19,509 |
Computer software implementation in process |  | N/A |  |  | 2,590 |  |  | 4,318 |
Construction in process |  | N/A |  |  | 1,049 |  |  | 790 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total |  |  |  |  | 389,655 |  |  | 246,836 |
Less accumulated depreciation and amortization |  |  |  |  | (248,116 | ) |  | (131,312 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Property and equipment, net |  |  |  | $ | 141,539 |  | $ | 115,524 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
During fiscal 2016, 2017 and 2018, depreciation expense was approximately $52.2 million, $56.0 million and $43.3 million, respectvely. In September 2017, we purchased the AS&E facility in Billerica, MA for $19.8 million. In January 2018, we entered into a new two-year agreement with the Mexican government to provide security screening services. Upon inception of the new contract, we transferred certain fixed assets with a net book value of $29.5 million to the customer, and this remaining cost to obtain the contract is amortized on a straightline basis over the term of the contract as corresponding revenues are recognized. During fiscal 2018, we recognized $6.9 million of amortization expense related to such assets. As of June 30, 2018, $14.7 million and $7.9 million are recorded within Prepaid expenses and other current assets and Other assets, respectively.

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- References No definition available. + Details
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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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