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Property, Plant and Equipment, net
3 Months Ended
Aug. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net
Property, Plant and Equipment, net
 
Property, plant and equipment consisted of the following:
 
 
Useful Life
(Years)
 
August 31, 2016
 
May 31, 2016
 
 
 
 
 
 
Land
 
 
$
1,728

 
$
1,735

Buildings and improvements
30-40
 
19,434

 
19,364

Office furniture and equipment
5-8
 
8,780

 
8,692

Machinery and equipment
5-7
 
174,821

 
173,053

 
 
 
204,763

 
202,844

Accumulated depreciation and amortization
 
 
(128,101
)
 
(124,168
)
Property, plant and equipment, net
 
 
$
76,662

 
$
78,676


 
Depreciation expense for the three months ended August 31, 2016 and August 31, 2015 was $5.8 million and $5.6 million, respectively.