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Property, Plant and Equipment, at Cost
12 Months Ended
May 31, 2014
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT, AT COST
PROPERTY, PLANT AND EQUIPMENT, AT COST
Property, plant and equipment are summarized as follows:
 
 
May 31, 2014
 
May 31, 2013
 
Estimated
useful lives
 
(in thousands)
 
 
Building and building improvements
$
33,126

 
$
30,150

 
39 years
Machinery and equipment
32,091

 
31,129

 
3 to 8 years
Computer software and equipment
25,836

 
16,390

 
3 to 10 years
Construction in progress
12,564

 
13,373

 
 
 
103,617

 
91,042

 
 
Less accumulated depreciation and amortization
(37,438
)
 
(29,421
)
 
 
 
66,179

 
61,621

 
 
Land and land improvements
1,029

 
1,029

 
 
 
$
67,208

 
$
62,650

 
 

Depreciation expense for fiscal 2014, 2013 and 2012 was $8.0 million, $8.7 million and $3.6 million, respectively.