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Property, Plant and Equipment, Net (Tables)
12 Months Ended
May 31, 2018
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Refer below for useful lives by category:
 
 
Estimated useful lives
Building and building improvements
 
39 years
Machinery and equipment
 
5 to 8 years
Computer software and equipment
 
3 to 5 years
As of May 31, 2018 and 2017, property, plant and equipment are summarized as follows:
 
 
May 31, 2018
 
May 31, 2017
(in thousands)
 
Building and building improvements
$
39,887

 
$
40,597

Machinery and equipment
22,668

 
25,434

Computer software and equipment
24,899

 
25,668

Construction in progress
2,153

 
1,464

 
89,607

 
93,163

Less accumulated depreciation and amortization
(48,794
)
 
(49,652
)
 
40,813

 
43,511

Land and land improvements
1,648

 
1,723

 
$
42,461

 
$
45,234