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Property, Plant and Equipment, at Cost (Tables) | 12 Months Ended
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May 31, 2016
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | Property, Plant and Equipment Property, plant and equipment are stated at cost, less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets. Refer below for useful lives by category:
|  | Estimated useful lives
Building and building improvements |  | 39 years
Machinery and equipment |  | 3 to 8 years
Computer software and equipment |  | 3 to 10 years
We evaluate these assets for impairment periodically or as changes in circumstances or the occurrence of events suggest the remaining value is not recoverable. Expenditures for repairs and maintenance are charged to expense as incurred. Renewals and betterments are capitalized. roperty, plant and equipment are summarized as follows:
| May 31, 2016 |  | May 31, 2015
| (in thousands)
Building and building improvements | $ | 39,585 |  |  | $ | 33,853 |
Machinery and equipment | 24,078 |  |  | 23,626 |
Computer software and equipment | 24,691 |  |  | 24,431 |
Construction in progress | 1,743 |  |  | 7,033 |
| 90,097 |  |  | 88,943 |
Less accumulated depreciation and amortization | (43,536 | ) |  | (36,197 | )
| 46,561 |  |  | 52,746 |
Land and land improvements | 1,723 |  |  | 1,704 |
| $ | 48,284 |  |  | $ | 54,450 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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