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Selected Financial Statement Data (Tables)
 12 Months Ended
Apr. 28, 2018
Selected Financial Statement Data [Abstract]  
Schedule of Inventories
Inventories consisted of the following: 
 
April 28,
2018
 
April 29,
2017
Raw materials
$
30,570

 
$
24,801

Work-in-process
8,645

 
7,366

Finished goods
36,120

 
34,319

 
$
75,335

 
$
66,486
Schedule of Property and Equipment
Property and equipment is stated at cost and depreciated principally on the straight-line method over the following estimated useful lives:
 
Years
Buildings and improvements
5 - 40
Machinery and equipment
5 - 7
Office furniture and equipment
3 - 5
Computer software and hardware
3 - 5
Equipment held for rental
2 - 7
Demonstration equipment
3 - 5
Transportation equipment
5 - 7
Property and equipment, net consisted of the following:
 
April 28,
2018
 
April 29,
2017
Land
$
2,161

 
$
2,099

Buildings
67,773

 
65,935

Machinery and equipment
93,439

 
84,189

Office furniture and equipment
5,878

 
5,604

Computer software and hardware
53,004

 
51,523

Equipment held for rental
287

 
374

Demonstration equipment
7,035

 
7,109

Transportation equipment
7,632

 
7,108

 
237,209

 
223,941

Less accumulated depreciation
169,150

 
157,192

 
$
68,059

 
$
66,749
Schedule of Accrued Expenses
Accrued expenses consisted of the following:
 
April 28,
2018
 
April 29,
2017
Compensation
$
12,841

 
$
12,732

Taxes, other than income taxes
2,907

 
3,878

Accrued employee benefits
2,829

 
2,916

Short-term accrued expenses
6,157

 
5,357

Claims liabilities
2,711

 
150

 
$
27,445

 
$
25,033
Schedule of Other (Expense) Income
Other (expense) income, net consisted of the following:
 
Year Ended
 
April 28,
2018
 
April 29,
2017
 
April 30,
2016
Foreign currency transaction gains (losses)
$
29

 
$
(331
)
 
$
(326
)
Equity in losses of affiliates
(481
)
 
(136
)
 
—

Other
(85
)
 
113

 
198

 
$
(537
)
 
$
(354
)
 
$
(128
)