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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 28, 2019
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Expense By Type of Award
Stock-based compensation expense recognized in the Consolidated Statements of Income is as follows:
 
 
2019
 
2018
 
2017
Stock-based compensation expense by type of award
 
 

 
 

 
 

Employee stock options
 
$
2,415

 
$
1,849

 
$
1,588

Employee stock purchase plan
 
321

 
283

 
298

Restricted stock units and performance restricted stock units
 
6,694

 
5,112

 
3,737

Amounts capitalized as inventory
 
(2,875
)
 
(1,799
)
 
(1,444
)
Amounts recognized in income for amounts previously capitalized as inventory
 
2,842

 
1,838

 
1,421

Total stock-based compensation included in income from operations
 
9,397

 
7,283

 
5,600

Income tax benefit on stock-based compensation
 
(1,978
)
 
(1,763
)
 
(1,893
)
Net stock-based compensation expense included in net income
 
$
7,419

 
$
5,520

 
$
3,707
Assumptions Used to Determine Fair Value of Stock Options Granted
The weighted average assumptions used to determine fair value of stock options granted are as follows:
 
 
2019
 
2018
 
2017
Expected life (in years)
 
3.7

 
4.0

 
4.0

Risk-free interest rate
 
2.8
%
 
2.6
%
 
1.6
%
Expected volatility
 
29.2
%
 
29.4
%
 
29.2
%
Dividend yield
 
2.5
%
 
2.3
%
 
2.6
%
Schedule of Stock Options Activity
Stock option activity is as follows:
 
 
2019
 
2018
 
2017
 
 
Shares
 
WAEP1
 
Shares
 
WAEP1
 
Shares
 
WAEP1
Options outstanding at beginning of year
 
881

 
$
56.57

 
766

 
$
57.86

 
784

 
$
60.34

Granted
 
231

 
$
48.58

 
245

 
$
52.30

 
288

 
$
46.35

Exercised
 
(47
)
 
$
48.04

 
(19
)
 
$
47.26

 
(112
)
 
$
40.68

Forfeited or expired
 
(85
)
 
$
56.47

 
(111
)
 
$
57.64

 
(194
)
 
$
60.74

Options outstanding at end of year
 
980

 
$
55.11

 
881

 
$
56.57

 
766

 
$
57.86

Options eligible for exercise at year end
 
565

 
$
59.37

 
443

 
$
61.61

 
329

 
$
64.52

1 
Weighted Average Exercise Price
Schedule of Restricted Stock Grants and Unit Activity
Restricted stock unit and performance restricted stock unit activity are as follows:
 
 
2019
 
2018
 
2017
 
 
Shares
 
WAGDFV2
 
Shares
 
WAGDFV2
 
Shares
 
WAGDFV2
Outstanding at beginning of year
 
267

 
$
48.99

 
223

 
$
49.95

 
165

 
$
58.98

Granted
 
189

 
$
47.41

 
140

 
$
49.67

 
157

 
$
45.05

Vested and released
 
(97
)
 
$
50.12

 
(75
)
 
$
52.45

 
(68
)
 
$
59.07

Forfeited
 
(33
)
 
$
47.44

 
(21
)
 
$
48.96

 
(31
)
 
$
53.08

Outstanding at end of year
 
326

 
$
47.88

 
267

 
$
48.99

 
223

 
$
49.95

2 
Weighted Average Grant Date Fair Value per share