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Selected Financial Statement Data (Tables)
9 Months Ended
Jan. 26, 2019
Selected Financial Statement Data [Abstract]  
Schedule of Inventory
Inventories consisted of the following: 
 
January 26,
2019
 
April 28,
2018
Raw materials
$
27,028

 
$
30,570

Work-in-process
10,743

 
8,645

Finished goods
34,416

 
36,120

 
$
72,187

 
$
75,335

Schedule of Property and Equipment
Property and equipment, net consisted of the following:
 
January 26,
2019
 
April 28,
2018
Land
$
1,738

 
$
2,161

Buildings
66,170

 
67,773

Machinery and equipment
98,409

 
93,439

Office furniture and equipment
6,079

 
5,878

Computer software and hardware
55,000

 
53,004

Equipment held for rental
287

 
287

Demonstration equipment
7,331

 
7,035

Transportation equipment
7,724

 
7,632

 
242,738

 
237,209

Less accumulated depreciation
176,973

 
169,150

 
$
65,765

 
$
68,059