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Shareholders' Equity and Share-Based Compensation (Tables)
 12 Months Ended
Apr. 29, 2017
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 fiscal years 2017, 2016, and 2015 is as follows:
 
Year Ended
 
April 29, 2017
 
April 30, 2016
 
May 2, 2015
 
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
384

 
$
9.10

 
344

 
$
10.63

 
318

 
$
9.59

Granted
157

 
8.00

 
159

 
7.04

 
150

 
12.25

Vested
(134
)
 
9.03

 
(110
)
 
10.76

 
(111
)
 
9.83

Forfeited
(5
)
 
8.98

 
(9
)
 
10.69

 
(13
)
 
10.70

Outstanding at end of year
402

 
$
8.69

 
384

 
$
9.10

 
344

 
$
10.63
Schedule of Stock Option Award Activity
A summary of stock option activity under all stock option plans during the fiscal year ended April 29, 2017 is as follows:
 
Stock Options
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value
Outstanding at April 30, 2016
2,606

 
$
13.50

 
4.57

 
$
158

Granted
234

 
9.57

 
—

 
—

Canceled or forfeited
(320
)
 
29.41

 
—

 
—

Exercised
(39
)
 
8.78

 
—

 
64

Outstanding at April 29, 2017
2,481

 
$
11.15

 
4.53

 
$
768

 
 
 
 
 
 
 
 
Shares vested and expected to vest
2,458

 
$
11.16

 
4.50

 
$
762

Exercisable at April 29, 2017
1,868

 
$
11.49

 
3.49

 
$
635
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
 
April 29,
2017
 
April 30,
2016
 
May 2,
2015
Fair value of options granted
$
2.93

 
$
2.92

 
$
5.44

Risk-free interest rate
1.31 - 1.44%

 
1.70 - 1.90%

 
1.93 - 2.14%

Expected dividend rate
3.15
%
 
2.78
%
 
2.60
%
Expected volatility
44.12 - 44.51%

 
42.71 - 48.32%

 
48.01 - 51.89%

Expected life of option
5.78 - 6.98 years

 
5.78 - 6.98 years

 
5.84 - 6.95 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
 
April 29,
2017
 
April 30,
2016
 
May 2,
2015
Stock options
$
1,072

 
$
1,179

 
$
1,311

Restricted stock and stock units
1,287

 
1,237

 
1,234

Employee stock purchase plans
555

 
542

 
493

 
$
2,914

 
$
2,958

 
$
3,038
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 fiscal years 2017, 2016, and 2015 is as follows:
 
Year Ended
 
April 29,
2017
 
April 30,
2016
 
May 2,
2015
Cost of goods sold
$
714

 
$
751

 
$
737

Selling
723

 
780

 
825

General and administrative
877

 
839

 
908

Product design and development
600

 
588

 
568

 
$
2,914

 
$
2,958

 
$
3,038