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Selected Financial Statement Data (Tables)
12 Months Ended
Apr. 26, 2014
Selected Financial Statement Data [Abstract]  
Schedule of Inventories
Inventories consisted of the following: 
 
April 26,
2014
 
April 27,
2013
Raw materials
$
27,660

 
$
20,979

Work-in-process
11,835

 
8,523

Finished goods
22,733

 
19,543

 
$
62,228

 
$
49,045

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 26,
2014
 
April 27,
2013
Land
$
2,539

 
$
1,497

Buildings
59,363

 
57,012

Machinery and equipment
72,787

 
65,600

Office furniture and equipment
15,754

 
16,118

Computer software and hardware
45,329

 
41,745

Equipment held for rental
868

 
868

Demonstration equipment
7,532

 
8,400

Transportation equipment
4,823

 
4,026

 
208,995

 
195,266

Less accumulated depreciation
143,725

 
133,641

 
$
65,270

 
$
61,625

Schedule of Accrued Expenses
Accrued expenses consisted of the following:
 
April 26,
2014
 
April 27,
2013
Compensation
$
14,189

 
$
12,940

Taxes, other than income taxes
2,977

 
2,534

Short term and other
6,296

 
8,857

 
$
23,462

 
$
24,331

Schedule of Other (Expense) Income
Other (expense) income, net consisted of the following:
 
Year Ended
 
April 26,
2014
 
April 27,
2013
 
April 28,
2012
Foreign currency transaction (losses)
$
(292
)
 
$
(319
)
 
$
(206
)
Other
(63
)
 
(520
)
 
96

 
$
(355
)
 
$
(839
)
 
$
(110
)