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Stock-based Compensation and Stockholders’ Equity (Tables)
 12 Months Ended
May 26, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Weighted Average Assumptions
As of May 26, 2019, May 27, 2018 and May 28, 2017, the fair value of stock option grants was estimated using the following weighted average assumptions:
 
Year Ended
 
May 26, 2019
 
May 27, 2018
 
May 28, 2017
Options granted
368,264

 
498,000

 
240,000

Weighted-average exercise price
$11.85
 
$12.93
 
$11.58
Weighted-average grant date fair value
$2.80
 
$2.90
 
$2.37
Assumptions:
 
 
 
 
 
Expected life (in years)
3.50

 
3.50

 
3.50

Risk-free interest rate
2.47
%
 
1.73
%
 
1.08
%
Volatility
27
%
 
27
%
 
26
%
Dividend yield
—
%
 
—
%
 
—
%
Schedule of Share-based Compensation Activity
A summary of the activity under the Company's stock option plans as of May 26, 2019 and changes during the fiscal year then ended is presented below:
 
Options Outstanding
 
Weighted-Average Exercise Price Per Share
 
Total Intrinsic Value of Options Exercised
 
Weighted-Average Remaining Contractual Term in Years
 
Aggregate Intrinsic Value
Options outstanding at May 29, 2016
1,731,474

 
$
11.90

 
 
 
 
 
 
Options granted
240,000

 
$
11.58

 
 
 
 
 
 
Options exercised
(357,639
)
 
$
5.93

 
$
2,780,597

 
 
 
 
Options forfeited
(42,293
)
 
$
12.16

 
 
 
 
 
 
Options expired
—

 
$
—

 
 
 
 
 
 
Options outstanding at May 28, 2017
1,571,542

 
$
13.20

 
 
 
 
 
 
Options granted
498,000

 
$
12.93

 
 
 
 
 
 
Options exercised
(29,333
)
 
$
7.36

 
$
177,921

 
 
 
 
Options forfeited
(23,334
)
 
$
12.55

 
 
 
 
 
 
Options expired
(61,540
)
 
$
14.23

 
 
 
 
 
 
Options outstanding at May 27, 2018
1,955,335

 
$
13.20

 
 
 
 
 
 
Options granted
368,264

 
$
11.85

 
 
 
 
 
 
Options exercised
(116,834
)
 
$
11.82

 
$
265,911

 
 
 
 
Options forfeited
(71,669
)
 
$
13.75

 
 
 
 
 
 
Options expired
(135,000
)
 
$
14.18

 
 
 
 
 
 
Options outstanding at May 26, 2019
2,000,096

 
$
12.94

 
 
 
3.29
 
$
16,807

Options exercisable at May 26, 2019
1,524,473

 
$
13.30

 
 
 
2.41
 
$
5,467

A summary of the Company's restricted stock unit award activity as of May 26, 2019 and changes during the fiscal year then ended is presented below:
 
Restricted Stock Units Outstanding
 
Weighted-Average Grant Date Fair Value Per Share
Restricted stock units outstanding at May 29, 2016
526,841

 
$
13.51

Granted
130,522

 
$
13.37

Vested
(130,508
)
 
$
13.42

Forfeited
(17,500
)
 
$
12.46

Restricted stock units outstanding at May 28, 2017
509,355

 
$
13.53

Granted
200,288

 
$
13.12

Vested
(270,656
)
 
$
14.06

Forfeited
(30,950
)
 
$
11.75

Restricted stock units outstanding at May 27, 2018
408,037

 
$
12.99

Granted
333,486

 
$
13.15

Vested
(237,946
)
 
$
13.27

Forfeited
(75,150
)
 
$
13.92

Restricted stock units outstanding at May 26, 2019
428,427

 
$
12.80
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table summarizes the stock-based compensation by income statement line item:
 
Year Ended
(in thousands)
May 26, 2019
 
May 27, 2018
 
May 28, 2017
Cost of sales
$
449

 
$
535

 
$
485

Research and development
114

 
131

 
83

Selling, general and administrative
2,997

 
3,737

 
3,396

Total stock-based compensation
$
3,560

 
$
4,403

 
$
3,964