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Shareholders' Equity and Share-Based Compensation (Tables)
12 Months Ended
May. 02, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock and Restricted Stock Units Activity
A summary of nonvested restricted stock and restricted stock units for the years ended May 2, 2015, April 26, 2014 and April 27, 2013 is as follows:
 
Year Ended
 
May 2, 2015
 
April 26, 2014
 
April 27, 2013
 
Number of
Nonvested
Shares
 
Weighted Average Grant Date Fair Value Per Share
 
Number of
Nonvested
Shares
 
Weighted Average Grant Date Fair Value Per Share
 
Number of
Nonvested
Shares
 
Weighted Average Grant Date Fair Value Per Share
Outstanding at beginning of year
318

 
$
9.59

 
279

 
$
9.74

 
242

 
$
9.81

Granted
150

 
12.25

 
147

 
10.03

 
119

 
8.50

Vested
(111
)
 
9.83

 
(85
)
 
9.47

 
(69
)
 
12.05

Forfeited
(13
)
 
10.70

 
(23
)
 
9.37

 
(13
)
 
9.63

Outstanding at end of year
344

 
10.63

 
318

 
9.59

 
279

 
9.74

Schedule of Stock Option Award Activity
A summary of stock option activity under all stock option plans during the fiscal year ended May 2, 2015 is as follows:
 
Stock Options
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value
Outstanding at April 26, 2014
2,935

 
$
13.77

 
5.00

 
$
6,333

Granted
205

 
13.31

 

 

Canceled or forfeited
(167
)
 
14.57

 

 

Exercised
(232
)
 
10.84

 

 
533

Outstanding at May 2, 2015
2,741

 
$
13.94

 
4.63

 
$
2,258

 
 
 
 
 
 
 
 
Shares vested and expected to vest
2,714

 
$
13.96

 
4.60

 
$
2,244

Exercisable at May 2, 2015
2,018

 
$
14.96

 
3.54

 
$
1,802

Schedule of Weighted-Average Assumptions
The following table provides the weighted-average fair value of options granted and the related assumptions used in the Black-Scholes model:
 
Year Ended
 
May 2,
2015
 
April 26,
2014
 
April 27,
2013
Fair value of options granted
$
5.44

 
$
4.91

 
$
3.43

Risk-free interest rate
1.93 - 2.14%

 
2.03 - 2.34%

 
0.71 - 1.13%

Expected dividend rate
2.60
%
 
2.32%

 
2.43%

Expected volatility
48.01 - 51.89%

 
54.09 - 54.37%

 
45.60 - 46.15%

Expected life of option
5.84 - 6.95 years

 
5.9 - 6.9 years

 
5.9 - 6.8 years

Schedule of Share-Based Compensation Expense by Award Type
The following table presents a summary of the share-based compensation expense by equity type as follows:
 
Year Ended
 
May 2,
2015
 
April 26,
2014
 
April 27,
2013
Stock options
$
1,311

 
$
1,451

 
$
1,812

Restricted stock and stock units
1,234

 
1,000

 
765

Employee stock purchase plans
493

 
446

 
460

 
$
3,038

 
$
2,897

 
$
3,037

Schedule of Share-Based Compensation Expense
A summary of the share-based compensation expenses for stock options, restricted stock, restricted stock units and shares issued under the ESPP for the fiscal years ended May 2, 2015, April 26, 2014 and April 27, 2013 is as follows:
 
Year Ended
 
May 2,
2015
 
April 26,
2014
 
April 27,
2013
Cost of goods sold
$
737

 
$
657

 
$
633

Selling
825

 
810

 
856

General and administrative
908

 
859

 
980

Product design and development
568

 
571

 
568

 
$
3,038

 
$
2,897

 
$
3,037