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Employee Stock Award and Benefit Plans (Tables)
 12 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of deferred compensation plans' investments and liabilities
These investments and the liability to the employees were as follows (in thousands):
 
Fiscal year-end
 
2017
 
2016
Cash surrender value of life insurance contracts
$
13,995

 
$
13,636

Fair value of mutual and money market funds
17,870

 
14,399

Total assets
$
31,865

 
$
28,035

 
 
 
 
Total assets, included in:
 

 
 

Prepaid expenses and other assets
$
856

 
$
1,679

Other assets
31,009

 
26,356

Total assets
$
31,865

 
$
28,035


 
Fiscal year-end
 
2017
 
2016
Total deferred compensation liability, included in:
 
 
 
Other current liabilities
$
856

 
$
1,679

Other long-term liabilities
34,160

 
28,313

Total deferred compensation liability
$
35,016

 
$
29,992
Schedule of weighted-average assumptions used to estimate fair value of stock options granted and shares purchased
The fair values of shares purchased under the employee stock purchase plan for fiscal 2017, 2016 and 2015 were estimated using the following weighted-average assumptions:
 
 
Employee Stock Purchase Plans
 
 
Fiscal
 
 
2017
 
2016
 
2015
Expected life in years
 
0.5

 
0.5

 
0.5

Expected volatility
 
33.0
%
 
35.0
%
 
28.6
%
Risk-free interest rate
 
0.7
%
 
0.3
%
 
0.1
%
Weighted average fair value per share
 
$
39.40

 
$
18.59

 
$
14.39
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions
The weighted average fair value for these performance units was determined using a Monte Carlo simulation model incorporating the following weighted average assumptions: 
 
Fiscal
 
2017
 
2016
 
2015
Risk-free interest rate
1.3
%
 
1.2
%
 
1.0
%
Volatility
31.0
%
 
27.0
%
 
28.7
%
Weighted average fair value
$
163.17

 
$
74.48

 
$
70.57
Schedule of stock-based compensation expense
The following table shows total stock-based compensation expense and related tax benefits included in the Consolidated Statements of Operations for fiscal 2017, 2016 and 2015 (in thousands):
 
Fiscal
 
2017
 
2016
 
2015
Cost of sales
$
3,541

 
$
2,558

 
$
2,530

Research and development
2,973

 
2,268

 
1,946

Selling, general and administrative
23,911

 
15,331

 
13,756

Income tax benefit
(7,073
)
 
(4,896
)
 
(4,247
)
 
$
23,352

 
$
15,261

 
$
13,985
Schedule of restricted stock award and restricted stock unit activity
The following table summarizes the activity of our time-based and performance restricted stock units for fiscal 2017, 2016 and 2015 (in thousands, except per share amounts):
 
Time Based Restricted Stock Units
 
Performance Restricted Stock Units
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
Nonvested stock at September 27, 2014
390

 
$
58.66

 
229

 
$
61.46

Granted
237

 
64.84

 
51

 
70.57

Vested (1)
(219
)
 
53.62

 
(38
)
 
53.46

Forfeited
(14
)
 
59.06

 
(43
)
 
53.46

Nonvested stock at October 3, 2015
394

 
$
65.17

 
199

 
$
67.09

Granted
270

 
64.42

 
65

 
74.48

Vested(1)
(192
)
 
61.11

 
(57
)
 
48.48

Forfeited
(13
)
 
63.89

 
(38
)
 
48.48

Nonvested stock at October 1, 2016
459

 
$
66.47

 
169

 
$
74.10

Granted
186

 
131.54

 
115

 
163.17

Vested(1)
(229
)
 
66.02

 
(104
)
 
77.10

Forfeited
(17
)
 
84.79

 
(4
)
 
70.57

Nonvested stock at September 30, 2017
399

 
$
118.83

 
176

 
$
105.34

__________________________________________
(1)
Service-based restricted stock units vested during each fiscal year. Performance-based restricted stock units included at 100% of target goal; under the terms of the awards, the recipient may earn between 0% and 200% of the award.