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Equity Plans (Tables)
12 Months Ended
Sep. 03, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule option activity
Option activity for 2015 is summarized as follows:

 
 
Number of Shares
 
Weighted-Average Exercise Price Per Share
 
Weighted-Average Remaining Contractual Life
(In Years)
 
Aggregate Intrinsic Value
Outstanding at August 28, 2014
 
48

 
$
10.57

 
 
 
 
Granted
 
8

 
34.45

 
 
 
 
Exercised
 
(10
)
 
7.35

 
 
 
 
Canceled or expired
 
(2
)
 
15.93

 
 
 
 
Outstanding at September 3, 2015
 
44

 
15.33

 
3.8
 
$
256

 
 
 
 
 
 
 
 
 
Exercisable at September 3, 2015
 
18

 
$
9.33

 
2.4
 
$
145

Expected to vest after September 3, 2015
 
25

 
19.11

 
4.7
 
109

Assumptions used in Black-Scholes option valuation model

Stock options granted and assumptions used in the Black-Scholes option valuation model were as follows:
For the year ended
 
2015
 
2014
 
2013
Stock options granted
 
8

 
12

 
18

Weighted-average grant-date fair value per share
 
$
14.79

 
$
9.64

 
$
3.34

Average expected life in years
 
5.6

 
4.9

 
5.1

Weighted-average expected volatility
 
45
%
 
48
%
 
59
%
Weighted-average risk-free interest rate
 
1.7
%
 
1.6
%
 
0.7
%

Schedule restricted stock awards activity
Restricted Stock Awards activity for 2015 is summarized as follows:

 
 
Number of Shares
 
Weighted-Average Grant Date Fair Value Per Share
Outstanding at August 28, 2014
 
13

 
$
15.08

Granted
 
7

 
32.60

Restrictions lapsed
 
(5
)
 
13.48

Canceled
 
(1
)
 
19.81

Outstanding at September 3, 2015
 
14

 
23.88

 
 
 
 
 
Expected to vest after September 3, 2015
 
13

 
$
23.78


For the year ended
 
2015
 
2014
 
2013
Restricted stock awards granted
 
7

 
7

 
7

Weighted-average grant-date fair values per share
 
$
32.60

 
$
21.88

 
$
6.23

Aggregate fair values at vesting date
 
155

 
115

 
17

Stock-based compensation expense by caption
For the year ended
 
2015
 
2014
 
2013
Stock-based compensation expense by caption:
 
 
 
 
 
 
Cost of goods sold
 
$
65

 
$
39

 
$
27

Selling, general and administrative
 
60

 
50

 
45

Research and development
 
42

 
25

 
18

Other
 
1

 
1

 
1

 
 
$
168

 
$
115

 
$
91

 
 
 
 
 
 
 
Stock-based compensation expense by type of award:
 
 
 
 
 
 
Stock options
 
$
81

 
$
61

 
$
57

Restricted stock awards
 
87

 
54

 
34

 
 
$
168

 
$
115

 
$
91

Stock-based compensation expense by type of award
Stock-based Compensation Expense

For the year ended
 
2015
 
2014
 
2013
Stock-based compensation expense by caption:
 
 
 
 
 
 
Cost of goods sold
 
$
65

 
$
39

 
$
27

Selling, general and administrative
 
60

 
50

 
45

Research and development
 
42

 
25

 
18

Other
 
1

 
1

 
1

 
 
$
168

 
$
115

 
$
91

 
 
 
 
 
 
 
Stock-based compensation expense by type of award:
 
 
 
 
 
 
Stock options
 
$
81

 
$
61

 
$
57

Restricted stock awards
 
87

 
54

 
34

 
 
$
168

 
$
115

 
$
91