Retirement Plan (Tables)

12 Months Ended

Sep. 26, 2015

Retirement Plan [Abstract]

Schedule Of Projected Benefit Obligations And Change In Fair Value Of Plan Assets

​	Defined Benefit Pension Plans						Retiree Health Plan
​	2015			2014			2015			2014
Change in Projected Benefit Obligations (PBO)	​			​			​			​
PBO at beginning of period	​	$	192	​	$	178	​	$	2	​	$	2
Service cost	​		1	​	​	—	​		—	​	​	—
Interest cost	​		8	​	​	8	​		—	​	​	—
Actuarial loss (gain)	​		11	​	​	15	​		—	​	​	—
Benefit settlements	​		(9)	​	​	—	​		—	​	​	—
Benefits paid	​		(10)	​	​	(9)	​		—	​	​	—
PBO at end of period	​	$	193	​	$	192	​	$	2	​	$	2
Change in Fair Value of Plan Assets	​			​			​			​
Plan assets at beginning of period	​	$	154	​	$	141	​	$	—	​	$	—
Actual return on plan assets	​		3	​	​	15	​		—	​	​	—
Company contributions	​		4	​	​	7	​		—	​	​	—
Benefit settlements	​		(9)	​	​	—	​		—	​	​	—
Benefits paid	​		(10)	​	​	(9)	​		—	​	​	—
Plan assets at end of period	​		142	​	​	154	​		—	​	​	—
Net amount recognized	​	$	(51)	​	$	(38)	​	$	(2)	​	$	(2)

Weighted Average Assumptions Used To Determine Benefit Obligation And Benefit Cost

​	Defined Benefit Pension Plans				Retiree Health Plan
​	2015		2014		2015		2014
(Percents)	​		​		​		​
Weighted-average assumptions:	​		​		​		​
Discount rate for benefit obligation	​	4.0	​	4.0	​	3.0	​	2.9
Discount rate for net benefit cost	​	4.0	​	4.5	​	2.9	​	3.1
Expected return on plan assets for net benefit costs	​	7.25	​	8.0	​	N/A	​	N/A

Schedule Of Plan Asset Fair Values

Fiscal 2015 Asset Category

Level 1

Level 2

Level 3

Total

Cash and cash equivalents

​

$

8

​

$

—

​

$

—

​

$

8

U.S. large cap comingled equity funds

​

​

—

​

​

37

​

​

—

​

​

37

U.S. mid cap equity mutual funds

​

​

24

​

​

—

​

​

—

​

​

24

U.S. small cap equity mutual funds

​

​

2

​

​

—

​

​

—

​

​

2

International equity mutual funds

​

​

6

​

​

—

​

​

—

​

​

6

Real estate equity investment funds

​

​

3

​

​

—

​

​

—

​

​

3

Corporate bond mutual funds

​

​

21

​

​

—

​

​

—

​

​

21

Corporate bonds

​

​

—

​

​

31

​

​

—

​

​

31

Guaranteed investment account

​

​

—

​

​

—

​

​

10

​

​

10

Total

​

$

64

​

$

68

​

$

10

​

$

142

Fiscal 2014 Asset Category

Level 1

Level 2

Level 3

Total

Cash and cash equivalents

​

$

7

​

$

—

​

$

—

​

$

7

U.S. large cap comingled equity funds

​

​

—

​

​

47

​

​

—

​

​

47

U.S. mid cap equity mutual funds

​

​

27

​

​

—

​

​

—

​

​

27

U.S. small cap equity mutual funds

​

​

6

​

​

—

​

​

—

​

​

6

International equity mutual funds

​

​

10

​

​

—

​

​

—

​

​

10

Real estate equity investment funds

​

​

3

​

​

—

​

​

—

​

​

3

Corporate bond mutual funds

​

​

28

​

​

—

​

​

—

​

​

28

Corporate bonds

​

​

—

​

​

15

​

​

—

​

​

15

Guaranteed investment account

​

​

—

​

​

—

​

​

11

​

​

11

Total

​

$

81

​

$

62

​

$

11

​

$

154

Schedule Of Expected Benefit Payments

	Defined Benefit  Pension Plans			Retiree  Health Plan
2016		$	10		$	—
2017			10			—
2018			10			—
2019			10			—
2020			11			—
2021 − 2025			56			1

Schedule Of Net Pension And Retiree Health Benefit Expense

​	2015			2014			2013
Defined Benefit Pension Plans	​			​			​
Service cost	​	$	1	​	$	—	​	$	—
Interest cost	​		8	​	​	8	​	​	7
Amortization	​		1	​	​	—	​	​	3
Settlement charge	​		2	​	​	—	​	​	—
Expected return on plan assets	​		(12)	​	​	(11)	​	​	(10)
Net periodic benefit cost	​	$	—	​	$	(3)	​	$	—

Schedule Of Defined Benefit Pension Plan Asset Allocations

​	2015		2014
Asset Category	​		​
Equity securities and equity-like instruments	​	51%	​	60%
Debt securities and debt-like	​	37	​	28
Other	​	12	​	12
Total	​	100%	​	100%