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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 25, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Changes in Stock Options
Changes in stock options for the years ended December 25, 2019 and December 26, 2018, are as follows:
 
Shares
 
Weighted-Average
Exercise Price
Outstanding - December 27, 2017
2,309,103

 
$
7.65

Grants
311,272

 
10.98

Exercised
(269,549
)
 
6.81

Forfeited, cancelled or expired
(248,422
)
 
12.46

Outstanding - December 26, 2018
2,102,404

 
7.68

Grants
323,900

 
11.51

Exercised
(234,728
)
 
6.18

Forfeited, cancelled or expired
(114,006
)
 
13.35

Outstanding - December 25, 2019
2,077,570

 
$
8.14

Vested and expected to vest at December 25, 2019
2,066,768

 
$
8.12

Exercisable at December 25, 2019
1,518,145

 
$
6.93
Stock Options By Range of Exercise Prices
Stock options at December 25, 2019 are summarized as follows:
Range of Exercise Prices
 
Number
Outstanding
 
Weighted-Average
Remaining
Contractual Life
(in Years)
 
Weighted-
Average Exercise
Price
 
Number
Exercisable
 
Weighted-Average
Exercise Price
$4.09
 
99,531

 
3.50
 
$
4.09

 
99,531

 
$
4.09

$5.84
 
1,159,366

 
2.55
 
5.84

 
1,159,366

 
$
5.84

$9.65 - $13.95
 
731,158

 
8.54
 
11.51

 
175,097

 
$
11.86

$15.00
 
87,515

 
4.78
 
15.00

 
84,151

 
$
15.00

$4.09 - $15.00
 
$
2,077,570

 
3.28
 
$
8.14

 
$
1,518,145

 
$
6.93
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The weighted-average estimated fair value of employee stock options granted in fiscal 2019 and 2018 was $3.85 per share and $3.78 per share, respectively, using the Black–Scholes model with the following weighted-average assumptions used to value the option grants:
 
December 25, 2019
 
December 26, 2018
Expected volatility
28.7
%
 
28.4
%
Risk-free interest rate
2.3
%
 
2.9
%
Expected term (years)
6.25

 
6.25

Expected dividends
—

 
—
Schedule of Changes in Restricted Shares
Changes in restricted shares for the years ended December 25, 2019 and December 26, 2018, are as follows:
 
Shares
 
Weighted-Average
Fair Value
Unvested shares at December 27, 2017
196,642

 
$
13.70

Granted
395,880

 
$
10.22

Released
(45,991
)
 
$
13.86

Forfeited, cancelled, or expired
(55,831
)
 
$
13.42

Unvested shares at December 26, 2018
490,700

 
$
10.91

Granted
299,052

 
$
11.62

Released
(147,862
)
 
$
10.73

Forfeited, cancelled, or expired
(53,882
)
 
$
11.81

Unvested shares at December 25, 2019
588,008

 
$
11.23