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Property, Plant and Equipment, at Cost
12 Months Ended
May 31, 2016
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT, AT COST
PROPERTY, PLANT AND EQUIPMENT, AT COST
As of May 31, 2016 and 2015, property, 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


Depreciation expense for fiscal 2016, 2015 and 2014 was $8.2 million, $9.8 million and $8.4 million, respectively. In conjunction with the Operational Excellence Program that was announced in December 2013, we updated the estimated useful lives on certain manufacturing equipment. As a result of the change in the useful life, we recorded additional depreciation of $1.0 million, $1.5 million and $0.8 million for the years ended May 31, 2016, 2015 and 2014, respectively.