Increase in multiemployer plans withdrawal obligation.

No definition available.

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- Definition

Refers to number of full withdrawal from multi employer pension plans.

+ References

No definition available.

+ Details

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- Definition

The number of members serving on the Benefits Committee.

+ References

No definition available.

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- Definition

Refers to number of voluntary partial withdrawal from multi employer pension plans.

+ References

No definition available.

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- Definition

Sensitivity expressed as a percentage to determine a material impact to financial statement or related disclosures.

+ References

No definition available.

+ Details

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- Definition

The percentage threshold for unrecognized actuarial gains or losses in excess the greater of the projected benefit obligation and fair value of plan assets.

+ References

No definition available.

+ Details

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- Definition

Settlement threshold amount includes service and interest cost.

+ References

No definition available.

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- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of contributions made by the employer to defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(ii)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Section 35
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Paragraph 63
-Subparagraph B
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

+ Details

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

+ Details

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Health Care Cost Trend Rate
-URI http://asc.fasb.org/extlink&oid=6514820

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 15
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 15
-Paragraph 6
-Subparagraph (a)(1)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

+ Details

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- Definition

The ultimate trend rate for health care costs.

+ References

+ Details

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- Definition

Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 9
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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- Definition

Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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- Definition

Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

+ Details

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Employee Benefit Plans - Additional Information (Details)	12 Months Ended
	Sep. 24, 2016 USD ($) Member	Sep. 26, 2015 USD ($)	Sep. 27, 2014 USD ($)	Sep. 28, 2013 USD ($) Multiemployerpensionplan
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Defined benefit plan expected future benefit payments	$ 10,704,000
Pension settlement payments to either terminated or retired individuals	5,816,000	$ 5,777,000
Settlement threshold amount	5,041,000	5,128,000
Pension settlement charge	$ 2,000,000	2,000,000	$ 0
Health care cost trend	4.50%
Health care cost trend rate (in hundredths)	6.84%
Percentage of sensitivity increase or decrease of assumed health care cost trend rates (in hundredths)	1.00%
Estimated obligation due to withdrawal multi employer pension plans	$ 24,205,000	18,041,000		$ 7,000,000
Number of voluntary partial withdrawal from multi employer pension plans \| Multiemployerpensionplan				1
Number of full withdrawal from multi employer pension plans \| Multiemployerpensionplan				4
Increase in estimated obligation due to withdrawal multi employer pension plans	6,600,000	11,300,000
Contributions	748,000	1,073,000	1,168,000
Health and Welfare Benefits and Defined Annuity Plans [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Contributions	$ 1,446,000	1,817,000	1,897,000
Red [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Multiemployer plans, funded status	Less than 65 percent
Yellow [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Multiemployer plans, funded status	Between 65 and less than 80 percent
Green [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Multiemployer plans, funded status	At least 80 percent
Pension Benefits [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Minimum funding requirements paid for defined benefit pension plan	$ 715,000	0	0
Expenses (credits) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year	$ 5,201,000
Number of members on the Benefits Committee \| Member	6
Pension settlement payments to either terminated or retired individuals	$ 5,816,000	5,777,000
Pension settlement charge	$ (2,000,000)	$ (2,000,000)	$ 0
Percentage threshold of the greater of projected benefit obligation and market-related value plan assets as unrecognized actuarial gains and losses (in hundredths)	10.00%
Health care cost trend	0.00%	0.00%
Health care cost trend rate (in hundredths)	0.00%	0.00%	0.00%
Pension Benefits [Member] \| Fixed income securities [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Allocation percentage of plan assets, range minimum (in hundredths)	80.00%
Allocation percentage of plan assets, range maximum (in hundredths)	90.00%
Pension Benefits [Member] \| Equity securities [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Allocation percentage of plan assets, range minimum (in hundredths)	10.00%
Allocation percentage of plan assets, range maximum (in hundredths)	20.00%
Retiree Health and Life Benefits [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Minimum funding requirements paid for defined benefit pension plan	$ 838,000	$ 954,000
Expenses (credits) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year	(389,000)
Pension settlement payments to either terminated or retired individuals	0	0
Pension settlement charge	$ 0	$ 0	$ 0
Health care cost trend	6.84%	7.10%
Health care cost trend rate (in hundredths)	7.10%	7.12%	7.33%
Retirement Savings and Investment Plan 401(K) [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Contribution costs to the 401(k) Plan	$ 1,477,000	$ 1,844,000	$ 1,848,000