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Note 13 Stock-Based Compensation (Tables)
12 Months Ended
Sep. 30, 2017
Share-based Compensation [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
 
Year Ended
 
September 30,
2017
 
October 1,
2016
 
October 3,
2015
 
(In thousands)
Stock options
$
1,640

 
$
3,943

 
$
9,894

Restricted stock units, including performance-based awards
36,280

 
22,964

 
10,759

Total
$
37,920

 
$
26,907

 
$
20,653

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
Year Ended
 
September 30,
2017
 
October 1,
2016
 
October 3,
2015
 
(In thousands)
Cost of sales
$
8,959

 
$
7,350

 
$
6,611

Selling, general & administrative
28,169

 
18,903

 
13,859

Research & development
792

 
654

 
183

Total
$
37,920

 
$
26,907

 
$
20,653

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
 
 
October 3,
2015
Volatility
52.9
%
Risk-free interest rate
1.6
%
Dividend yield

Expected life of options
5.0

Share-based Compensation, Stock Options, Activity [Table Text Block]
 
Number of Shares
 
Weighted-Average Exercise Price
($)
 
Weighted-Average Remaining Contractual Term
(Years)
 
Aggregate Intrinsic Value of In-The-Money Options
($)
 
(In thousands)
 
 
 
 
 
(In thousands)
Outstanding as of September 27, 2014
8,181

 
12.90

 
5.30
 
93,767

Granted
567

 
24.48

 
 
 
 
Exercised/Cancelled/Forfeited/Expired
(1,715
)
 
16.13

 
 
 
 
Outstanding as of October 3, 2015
7,033

 
13.05

 
4.94
 
53,938

Granted
1

 
23.77

 
 
 
 
Exercised/Cancelled/Forfeited/Expired
(1,520
)
 
14.13

 
 
 
 
Outstanding as of October 1, 2016
5,514

 
12.75

 
4.10
 
81,659

Exercised/Cancelled/Forfeited/Expired
(1,946
)
 
14.44

 
 
 
 
Outstanding as of September 30, 2017
3,568

 
11.83

 
3.82
 
90,327

Exercisable as of September 30, 2017
3,469

 
11.51

 
3.73
 
88,950

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Options Outstanding
 
Options Vested and Exercisable
Range of Weighted Exercise Prices      
 
Number
Outstanding
 
Weighted Average Remaining Contractual Life
 (Years)
 
Weighted Average Exercise Price
($)
 
Number Exercisable
 
Weighted Average Exercise Price
($)
 
 
(In thousands)
 
 
 
 
 
(In thousands)
 
 
$1.80-$8.81
 
1,922

 
2.90
 
7.88

 
1,920

 
7.88

$8.82-$11.57
 
455

 
3.55
 
11.08

 
455

 
11.08

$11.58-$15.47
 
194

 
0.92
 
12.02

 
194

 
12.02

$15.48-$23.76
 
555

 
5.55
 
15.87

 
536

 
15.80

$23.77-$24.65
 
442

 
7.20
 
24.61

 
364

 
24.60

$1.80-$24.65
 
3,568

 
3.82
 
11.83

 
3,469

 
11.51

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
 
Number of Shares
 
Weighted Grant-Date Fair Value Per Share
($)
 
Weighted-Average Remaining Contractual Term
(Years)
 
Aggregate Intrinsic Value
($)
 
(In thousands)
 
 
 
 
 
(In thousands)
Outstanding as of September 27, 2014
2,341

 
13.29

 
2.01
 
56,064

Granted
966

 
23.42

 
 
 
 
Vested/Forfeited/Cancelled
(328
)
 
13.79

 
 
 
 
Outstanding as of October 3, 2015
2,979

 
16.52

 
1.52
 
59,843

Granted
1,698

 
23.22

 
 
 
 
Vested/Forfeited/Cancelled
(679
)
 
15.33

 
 
 
 
Outstanding as of October 1, 2016
3,998

 
19.57

 
1.35
 
110,183

Granted
1,378

 
34.11

 
 
 
 
Vested/Forfeited/Cancelled
(2,017
)
 
16.20

 
 
 
 
Outstanding as of September 30, 2017
3,359

 
27.56

 
1.51
 
124,800

Expected to vest as of September 30, 2017
2,834

 
26.73

 
1.44
 
105,288