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Selected Financial Statement Data (Tables)
 12 Months Ended
May. 02, 2015
Selected Financial Statement Data [Abstract]  
Schedule of Inventories
Inventories consisted of the following: 
 
May 2,
2015
 
April 26,
2014
Raw materials
$
28,325

 
$
27,660

Work-in-process
7,512

 
11,835

Finished goods
28,552

 
22,733

 
$
64,389

 
$
62,228
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:
 
May 2,
2015
 
April 26,
2014
Land
$
2,147

 
$
2,539

Buildings
64,186

 
59,363

Machinery and equipment
80,664

 
72,787

Office furniture and equipment
15,823

 
15,754

Computer software and hardware
51,083

 
45,329

Equipment held for rental
803

 
868

Demonstration equipment
7,299

 
7,532

Transportation equipment
6,012

 
4,823

 
228,017

 
208,995

Less accumulated depreciation
155,173

 
143,725

 
$
72,844

 
$
65,270
Schedule of Accrued Expenses
Accrued expenses consisted of the following:
 
May 2,
2015
 
April 26,
2014
Compensation
$
12,137

 
$
14,189

Taxes, other than income taxes
4,223

 
2,977

Other
9,703

 
6,296

 
$
26,063

 
$
23,462
Schedule of Other (Expense) Income
Other (expense) income, net consisted of the following:
 
Year Ended
 
May 2,
2015
 
April 26,
2014
 
April 27,
2013
Foreign currency transaction (losses)
$
(514
)
 
$
(292
)
 
$
(319
)
Other
16

 
(63
)
 
(520
)
 
$
(498
)
 
$
(355
)
 
$
(839
)