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Selected Financial Statement Data (Tables)
 12 Months Ended
Apr. 30, 2016
Selected Financial Statement Data [Abstract]  
Schedule of Inventories
Inventories consisted of the following: 
 
April 30,
2016
 
May 2,
2015
Raw materials
$
28,184

 
$
28,325

Work-in-process
6,158

 
7,512

Finished goods
35,485

 
28,552

 
$
69,827

 
$
64,389
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 30,
2016
 
May 2,
2015
Land
$
2,155

 
$
2,147

Buildings
65,247

 
64,186

Machinery and equipment
82,973

 
80,664

Office furniture and equipment
14,746

 
15,823

Computer software and hardware
48,917

 
51,083

Equipment held for rental
374

 
803

Demonstration equipment
8,026

 
7,299

Transportation equipment
6,596

 
6,012

 
229,034

 
228,017

Less accumulated depreciation
155,871

 
155,173

 
$
73,163

 
$
72,844
Schedule of Accrued Expenses
Accrued expenses consisted of the following:
 
April 30,
2016
 
May 2,
2015
Compensation
$
12,065

 
$
12,137

Taxes, other than income taxes
3,969

 
4,223

Other
7,498

 
9,703

 
$
23,532

 
$
26,063
Schedule of Other (Expense) Income
Other (expense) income, net consisted of the following:
 
Year Ended
 
April 30,
2016
 
May 2,
2015
 
April 26,
2014
Foreign currency transaction losses
$
(326
)
 
$
(514
)
 
$
(292
)
Other
198

 
16

 
(63
)
 
$
(128
)
 
$
(498
)
 
$
(355
)