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Property, Plant and Equipment, Net | 12 Months Ended
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May 31, 2018
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT, NET | PROPERTY, PLANT AND EQUIPMENT, NET As of May 31, 2018 and 2017, property, plant and equipment are summarized as follows:
| May 31, 2018 |  | May 31, 2017
(in thousands) |
Building and building improvements | $ | 39,887 |  |  | $ | 40,597 |
Machinery and equipment | 22,668 |  |  | 25,434 |
Computer software and equipment | 24,899 |  |  | 25,668 |
Construction in progress | 2,153 |  |  | 1,464 |
| 89,607 |  |  | 93,163 |
Less accumulated depreciation and amortization | (48,794 | ) |  | (49,652 | )
| 40,813 |  |  | 43,511 |
Land and land improvements | 1,648 |  |  | 1,723 |
| $ | 42,461 |  |  | $ | 45,234 |
Depreciation expense for fiscal 2018, 2017 and 2016 was $4.6 million, $6.0 million and $8.2 million, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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