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Shareholders' Equity and Share-Based Compensation (Tables)
 12 Months Ended
Apr. 28, 2018
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 2018, 2017, and 2016 is as follows:
 
Year Ended
 
April 28, 2018
 
April 29, 2017
 
April 30, 2016
 
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
402

 
$
8.69

 
384

 
$
9.10

 
344

 
$
10.63

Granted
178

 
8.46

 
157

 
8.00

 
159

 
7.04

Vested
(141
)
 
9.06

 
(134
)
 
9.03

 
(110
)
 
10.76

Forfeited
(2
)
 
8.93

 
(5
)
 
8.98

 
(9
)
 
10.69

Outstanding at end of year
437

 
$
8.48

 
402

 
$
8.69

 
384

 
$
9.10
Schedule of Stock Option Award Activity
A summary of stock option activity under all stock option plans during the fiscal year ended April 28, 2018 is as follows:
 
Stock Options
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value
Outstanding at April 29, 2017
2,481

 
$
11.15

 
4.53

 
$
768

Granted
169

 
9.63

 
—

 
—

Canceled or forfeited
(287
)
 
19.78

 
—

 
—

Exercised
(58
)
 
8.91

 
—

 
65

Outstanding at April 28, 2018
2,305

 
$
10.02

 
4.51

 
$
356

 
 
 
 
 
 
 
 
Shares vested and expected to vest
2,282

 
$
10.02

 
4.47

 
$
354

Exercisable at April 28, 2018
1,788

 
$
10.04

 
3.50

 
$
304
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 28,
2018
 
April 29,
2017
 
April 30,
2016
Fair value of options granted
$
2.82

 
$
2.93

 
$
2.92

Risk-free interest rate
1.95
%
 
1.31 - 1.44%

 
1.70 - 1.90%

Expected dividend rate
3.27
%
 
3.15
%
 
2.78
%
Expected volatility
42.51%

 
44.12 - 44.51%

 
42.71 - 48.32%

Expected life of option
6.83 years

 
5.78 - 6.98 years

 
5.78 - 6.98 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 28,
2018
 
April 29,
2017
 
April 30,
2016
Stock options
$
763

 
$
1,072

 
$
1,179

Restricted stock and stock units
1,442

 
1,287

 
1,237

Employee stock purchase plans
430

 
555

 
542

 
$
2,635

 
$
2,914

 
$
2,958
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 2018, 2017, and 2016 is as follows:
 
Year Ended
 
April 28,
2018
 
April 29,
2017
 
April 30,
2016
Cost of sales
$
619

 
$
714

 
$
751

Selling
644

 
723

 
780

General and administrative
851

 
877

 
839

Product design and development
521

 
600

 
588

 
$
2,635

 
$
2,914

 
$
2,958