Equity Plans (Tables)
 9 Months Ended
May 30, 2013
Table Text Block [Abstract]  
Assumptions used in Black-Scholes option valuation model
 Assumptions used in the Black-Scholes model are presented below:

 
 
Quarter Ended
 
Nine Months Ended
 
 
May 30,
2013
 
May 31,
2012
 
May 30,
2013
 
May 31,
2012
Average expected life in years
 
4.8

 
5.0

 
5.1

 
5.1

Weighted-average expected volatility
 
55
%
 
61
%
 
60
%
 
66
%
Weighted-average risk-free interest rate
 
0.7
%
 
0.9
%
 
0.7
%
 
1.0
%
Schedule of restricted stock awards activity
Restricted Stock Awards granted for the third quarters and first nine months of 2013 and 2012 were as follows:

 
 
Quarter Ended
 
Nine Months Ended
 
 
May 30,
2013
 
May 31,
2012
 
May 30,
2013
 
May 31,
2012
Service-based awards
 
—

 
0.1

 
5.4

 
3.9

Performance-based awards
 
—

 
—

 
1.2

 
1.9

Weighted-average grant-date fair values per share
 
$
9.97

 
$
6.82

 
$
6.21

 
$
5.43
Stock-based compensation expense
Stock-based Compensation Expense

Total compensation costs for our equity plans were as follows:
 
 
Quarter Ended
 
Nine Months Ended
 
 
May 30,
2013
 
May 31,
2012
 
May 30,
2013
 
May 31,
2012
Stock-based compensation expense by caption:
 
 
 
 
 
 
 
 
Cost of goods sold
 
$
7

 
$
5

 
$
20

 
$
17

Selling, general and administrative
 
10

 
12

 
28

 
41

Research and development
 
4

 
4

 
13

 
13

 
 
$
21

 
$
21

 
$
61

 
$
71

 
 
 
 
 
 
 
 
 
Stock-based compensation expense by type of award:
 
 

 
 

 
 
 
 
Stock options
 
$
14

 
$
13

 
$
41

 
$
44

Restricted stock awards
 
7

 
8

 
20

 
27

 
 
$
21

 
$
21

 
$
61

 
$
71