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Property, Plant and Equipment (Tables)
 12 Months Ended
Apr. 30, 2016
Property, Plant and Equipment [Abstract]  
Components Of Property, Plant And Equipment
The components of property, plant and equipment were:
 
APRIL 30
(in thousands)
2016

2015
Land
$
2,311


$
5,929

Buildings and improvements
80,042


69,412

Buildings and improvements - capital leases
11,202


11,202

Machinery and equipment
182,937


159,680

Machinery and equipment - capital leases
29,357


29,052

Construction in progress
2,556


12,581


308,405


287,856

Less accumulated amortization and depreciation
(209,073
)

(202,340
)






Total
$
99,332


$
85,516