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%	0.6%
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