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Property, Plant and Equipment, at Cost (Tables)
12 Months Ended
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