Defined benefit plan benefit obligation payment settlement expiration date.

No definition available.

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- Definition

Defined Benefit Plan Ultimate Health Care Cost Trend Rate Twenty Forty.

+ References

No definition available.

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- Definition

Increase in multiemployer plans withdrawal obligation.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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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.

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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

Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with 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.

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- Definition

Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

+ 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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ 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)
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-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

+ References

+ Details

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- Definition

Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

+ Details

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

+ References

+ Details

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- Definition

Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

+ References

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

+ Details

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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- Definition

Amount of contributions made to multiemployer plan by employer.

+ 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

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-Publisher FASB
-Name Accounting Standards Codification
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-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

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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)
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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. 30, 2017 USD ($) Member	Sep. 24, 2016 USD ($)	Sep. 26, 2015 USD ($)	Sep. 28, 2013 USD ($) Multiemployerpensionplan
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Pension settlement charge	$ 6,100,000	$ 2,000,000	$ 2,000,000
Lump sum pension settlement payments, includes benefits paid to employees participated in limited-time opportunity	$ 16,237,000
Lump sum pension settlement payments expiration date	2017-08
Estimated obligation due to withdrawal multi employer pension plans	$ 23,665,000	24,205,000		$ 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
Health and Welfare Benefits and Defined Annuity Plans [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Contributions	$ 1,089,000	1,446,000	1,817,000
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] \| UNITED STATES
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
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%
Pension Benefits [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Contributions for defined benefit pension plan	$ 11,523,000	715,000	0
Expenses (credits) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year	$ 3,683,000
Number of members on the Benefits Committee \| Member	6
Defined benefit plan expected future benefit payments	$ 10,290,000
Pension settlement payments to either terminated or retired individuals	20,799,000	5,816,000	5,777,000
Settlement threshold amount	4,164,000	5,041,000	5,128,000
Pension settlement charge	$ (6,100,000)	$ (2,000,000)	(2,000,000)
Health care cost trend rate (in hundredths)	0.00%	0.00%
Contributions	$ 467,000	$ 748,000	1,073,000
Retiree Health and Life Benefits [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Contributions for defined benefit pension plan	1,187,000	838,000
Expenses (credits) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year	(1,152,000)
Pension settlement payments to either terminated or retired individuals	0	0
Pension settlement charge	$ 0	$ 0	0
Health care cost trend (in hundredths), twenty forty	4.50%
Health care cost trend rate (in hundredths)	6.57%	6.84%
Percentage of sensitivity increase or decrease of assumed health care cost trend rates (in hundredths)	1.00%
Maximum [Member] \| Pension Benefits [Member] \| Fixed income securities [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Allocation percentage of plan assets (in hundredths)	90.00%
Maximum [Member] \| Pension Benefits [Member] \| Equity securities [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Allocation percentage of plan assets (in hundredths)	20.00%
Minimum [Member] \| Pension Benefits [Member] \| Fixed income securities [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Allocation percentage of plan assets (in hundredths)	80.00%
Minimum [Member] \| Pension Benefits [Member] \| Equity securities [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Allocation percentage of plan assets (in hundredths)	10.00%
Retiree Health and Life Benefits [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Employer contribution match amount	$ 0.50
Contribution costs to the 401(k) Plan	$ 4,041,000	$ 1,477,000	$ 1,844,000
Retiree Health and Life Benefits [Member] \| Maximum [Member]
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items]
Eligible compensation match percentage	6.00%