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Shareholders' Equity and Share-Based Compensation (Tables)
 12 Months Ended
Apr. 27, 2019
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 2019, 2018, and 2017 is as follows:
 
Year Ended
 
April 27, 2019
 
April 28, 2018
 
April 29, 2017
 
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
437

 
$
8.48

 
402

 
$
8.69

 
384

 
$
9.10

Granted
181

 
6.79

 
178

 
8.46

 
157

 
8.00

Vested
(169
)
 
9.05

 
(141
)
 
9.06

 
(134
)
 
9.03

Forfeited
(5
)
 
7.74

 
(2
)
 
8.93

 
(5
)
 
8.98

Outstanding at end of year
444

 
$
7.58

 
437

 
$
8.48

 
402

 
$
8.69
Schedule of Stock Option Award Activity
A summary of stock option activity under our 2007 Plan and 2015 Plan during the fiscal year ended April 27, 2019 is as follows:
 
Stock Options
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value
Outstanding at April 28, 2018
2,305

 
$
10.02

 
4.51

 
$
356

Granted
175

 
7.83

 
—

 
—

Canceled or forfeited
(119
)
 
8.88

 
—

 
—

Exercised
(159
)
 
8.31

 
—

 
98

Outstanding at April 27, 2019
2,202

 
$
10.03

 
4.41

 
$
—

 
 
 
 
 
 
 
 
Shares vested and expected to vest
2,179

 
$
10.05

 
4.37

 
$
—

Exercisable at April 27, 2019
1,684

 
$
10.32

 
3.30

 
$
—
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 27,
2019
 
April 28,
2018
 
April 29,
2017
Fair value of options granted
$
2.16

 
$
2.82

 
$
2.93

Risk-free interest rate
2.83
%
 
1.95
%
 
1.31 - 1.44%

Expected dividend rate
3.37
%
 
3.27
%
 
3.15
%
Expected volatility
38.58
%
 
42.51
%
 
44.12 - 44.51%

Expected life of option
6.83 years

 
6.83 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 27,
2019
 
April 28,
2018
 
April 29,
2017
Stock options
$
593

 
$
763

 
$
1,072

Restricted stock and stock units
1,446

 
1,442

 
1,287

Employee stock purchase plans
440

 
430

 
555

 
$
2,479

 
$
2,635

 
$
2,914
Schedule of Share-Based Compensation Expense
A summary of the share-based compensation expense for stock options, restricted stock, restricted stock units and shares issued under the ESPP for fiscal years 2019, 2018, and 2017 is as follows:
 
Year Ended
 
April 27,
2019
 
April 28,
2018
 
April 29,
2017
Cost of sales
$
578

 
$
619

 
$
714

Selling
625

 
644

 
723

General and administrative
772

 
851

 
877

Product design and development
504

 
521

 
600

 
$
2,479

 
$
2,635

 
$
2,914