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Stockholders' Equity and Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 26, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Expense in Consolidated Statement of Operations
The following presents stock-based compensation expense in the Company’s Consolidated Statements of Operations in fiscal 2015, 2014 and 2013:
 
 
2015
 
2014
 
2013
Cost of revenues
 
$
8.7

 
$
7.3

 
$
7.0

Research and development
 
8.6

 
8.4

 
7.2

Selling and marketing
 
8.8

 
8.2

 
8.9

General and administrative
 
29.1

 
19.5

 
20.2

Restructuring and divestiture
 
4.1

 
6.6

 
9.0

 
 
$
59.3


$
50.0


$
52.3
Information Pertaining to Stock Options Granted and Related Assumptions
Information pertaining to stock options granted during fiscal 2015, 2014 and 2013 and related assumptions are noted in the following table:
 
 
Years ended
September 26, 2015
 
September 27, 2014
 
September 28, 2013
Options granted (in millions)
 
1.3

 
2.4

 
2.6

Weighted-average exercise price
 
$
27.68

 
$
22.01

 
$
20.29

Weighted-average grant date fair value
 
$
9.95

 
$
7.67

 
$
7.03

Assumptions:
 
 
 
 
 
 
Risk-free interest rates
 
1.7
%
 
1.2
%
 
0.5
%
Expected life (in years)
 
5.3

 
4.4

 
4.4

Expected volatility
 
38.6
%
 
41.4
%
 
43.7
%
Dividend yield
 
—

 
—

 
—
Stock Option Activity
The following table summarizes all stock option activity under the Company’s stock option plans for the year ended September 26, 2015:
 
 
 
Number
of Shares (in millions)
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual Life
(in Years)
 
Aggregate
Intrinsic
Value (in millions)
Options outstanding at September 27, 2014
 
9.8

 
$
20.59

 
4.1
 
$
46.4

Granted
 
1.3

 
27.68

 
 
 
 
Canceled/ forfeited
 
(1.4
)
 
23.36

 
 
 
 
Exercised
 
(3.0
)
 
18.89

 
 
 
$
42.0

Options outstanding at September 26, 2015
 
6.7

 
$
22.21

 
4.9
 
$
119.1

Options exercisable at September 26, 2015
 
3.0

 
$
21.05

 
3.2
 
$
56.6

Options vested and expected to vest at September 26, 2015 (1)
 
6.6

 
$
22.18

 
4.8
 
$
118.1

 
(1)
This represents the number of vested stock options as of September 26, 2015 plus the unvested outstanding options at September 26, 2015 expected to vest in the future, adjusted for estimated forfeitures.
Restricted Stock Unit Activity
A summary of the Company’s RSU activity during the year ended September 26, 2015 is presented below:
 
Non-vested Shares
 
Number of
Shares
(in millions)
 
Weighted-Average
Grant-Date  Fair
Value
Non-vested at September 27, 2014
 
4.1

 
$
20.67

Granted
 
1.6

 
27.19

Vested
 
(1.3
)
 
20.40

Forfeited
 
(0.7
)
 
21.37

Non-vested at September 26, 2015
 
3.7

 
$
24.54
Black-Scholes Model Weighted Average Assumptions Used to Estimate Fair Value of Shares to Be Issued as of Grant Date
The Company uses the Black-Scholes model to estimate the fair value of shares to be issued as of the grant date using the following weighted average assumptions:
 
 
September 26, 2015
 
September 27, 2014
 
September 28, 2013
Assumptions:
 
 
 
 
 
 
Risk-free interest rates
 
0.10
%
 
0.08
%
 
0.11
%
Expected life (in years)
 
0.5

 
0.5

 
0.5

Expected volatility
 
27.4
%
 
30.0
%
 
32.0
%
Dividend yield
 
—

 
—

 
—