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Stockholders Equity (Tables)
12 Months Ended
Sep. 26, 2015
Stockholders Equity [Abstract]  
Schedule Of Stock Option Activity
2015
2014
Number Of 
Shares 
(in thousands)
Weighted 
Average 
Exercise Price
Number Of 
Shares 
(in thousands)
Weighted 
Average 
Exercise Price
Options outstanding, beginning of period
10,504
$
13.13
10,035 $ 9.96
Options granted
2,839
28.78
2,727 21.02
Options exercised
(1,929)
9.07
(2,137) 8.19
Options forfeited or cancelled
(63)
17.59
(121) 15.20
Options outstanding, end of period
11,351
$
17.71
10,504 $ 13.13
Option price range at end of period
$
3.04 − 33.91
$ 3.04 − 22.95
Options exercisable at end of period
4,786
5,098
Options available for grant at period end
7,500
5,349
Weighted average fair value of options granted 
during period
$
9.51
$ 7.53
Schedule Of Assumptions Used For Options Granted
2015
2014
2013
Risk-free interest rate
1.6 %
1.3%
.6%
Dividend yield
0.00 %
0.00%
0.00%
Volatility factor
.30
.33
.38
Expected option life
7 years
7 years
7 years
 
Summary Of Options Outstanding By Exercise Price Range
Range of Exercise 
Prices
   
Number 
Outstanding
   
Intrinsic 
Value of 
Outstanding
   
Weighted 
Remaining 
Contractual 
Life
   
Weighted 
Exercise 
Price
   
Number 
Exercisable
   
Intrinsic 
Value of 
Exercisable
   
Unrecognized 
Compensation
   
Weighted 
Recognition 
Period
 
$3.04 – 33.91
        11,351         $ 143      
8 years
      $ 17.71           4,786         $ 92         $ 25      
2 years