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Selected Financial Statement Data (Tables)
 12 Months Ended
Apr. 29, 2017
Selected Financial Statement Data [Abstract]  
Schedule of Inventories
Inventories consisted of the following: 
 
April 29,
2017
 
April 30,
2016
Raw materials
$
24,801

 
$
28,184

Work-in-process
7,366

 
6,158

Finished goods
34,319

 
35,485

 
$
66,486

 
$
69,827
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
7 - 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 consisted of the following:
 
April 29,
2017
 
April 30,
2016
Land
$
2,099

 
$
2,155

Buildings
65,935

 
65,247

Machinery and equipment
84,189

 
82,973

Office furniture and equipment
5,604

 
14,746

Computer software and hardware
51,523

 
48,917

Equipment held for rental
374

 
374

Demonstration equipment
7,109

 
8,026

Transportation equipment
7,108

 
6,596

 
223,941

 
229,034

Less accumulated depreciation
157,192

 
155,871

 
$
66,749

 
$
73,163
Schedule of Accrued Expenses
Accrued expenses consisted of the following:
 
April 29,
2017
 
April 30,
2016
Compensation
$
12,732

 
$
12,065

Taxes, other than income taxes
3,878

 
3,969

Other
8,423

 
7,498

 
$
25,033

 
$
23,532
Schedule of Other (Expense) Income
Other (expense) income, net consisted of the following:
 
Year Ended
 
April 29,
2017
 
April 30,
2016
 
May 2,
2015
Foreign currency transaction losses
$
(331
)
 
$
(326
)
 
$
(514
)
Equity in losses of affiliates
(136
)
 
—

 
—

Other
113

 
198

 
16

 
$
(354
)
 
$
(128
)
 
$
(498
)