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Property, Plant and Equipment, net
9 Months Ended
Feb. 29, 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)
 
February 29, 2016
 
May 31, 2015
 
 
 
 
 
 
Land
 
 
$
1,719

 
$
1,856

Buildings and improvements
30-40
 
18,534

 
17,712

Office furniture and equipment
5-8
 
8,653

 
8,084

Machinery and equipment
5-7
 
166,379

 
162,612

 
 
 
195,285

 
190,264

Accumulated depreciation and amortization
 
 
(119,620
)
 
(111,008
)
Property, plant and equipment, net
 
 
$
75,665

 
$
79,256


 
Depreciation expense for the three months ended February 29, 2016 and February 28, 2015 was $5.5 million and $5.4 million, respectively. Depreciation expense for the nine months ended February 29, 2016 and February 28, 2015 was $16.7 million and $16.3 million, respectively.