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Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Property, plant and equipment |  |  |
Property, plant and equipment | $ 89,607 | $ 93,163 |
Less accumulated depreciation and amortization | (48,794) | (49,652) |
Property, plant and equipment excluding land and land improvements | 40,813 | 43,511 |
Land and land improvements | 1,648 | 1,723 |
Property, plant and equipment, Net | 42,461 | 45,234 |
Depreciation expense | 4,600 | 6,000 | $ 8,200
Building and building improvements |  |  |
Property, plant and equipment |  |  |
Property, plant and equipment | 39,887 | 40,597 |
Machinery and equipment |  |  |
Property, plant and equipment |  |  |
Property, plant and equipment | 22,668 | 25,434 |
Computer software and equipment |  |  |
Property, plant and equipment |  |  |
Property, plant and equipment | 24,899 | 25,668 |
Construction in progress |  |  |
Property, plant and equipment |  |  |
Property, plant and equipment | $ 2,153 | $ 1,464 |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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