Retirement Plans - Multiemployer Pension Plans (Detail)	12 Months Ended
Dec. 30, 2017	Dec. 31, 2016
Western Conference of Teamsters Pension Trust Fund [Member]
Multiemployer Plans [Line Items]
EIN	916145047
Plan Number	001
PPA Zone Status	Green	Green
FIP/RP Status Pending/ Implemented	NA
Surcharge Imposed	No
Expiration Dates	Mar. 31, 2018
Expiration Dates	Mar. 31, 2020
Minneapolis Food Distributing Industry Pension Plan [Member]
Multiemployer Plans [Line Items]
EIN	416047047
Plan Number	001
PPA Zone Status	Green	Green
FIP/RP Status Pending/ Implemented	Implemented
Surcharge Imposed	No
Expiration Dates	Apr. 01, 2021
Teamster Pension Trust Fund of Philadelphia and Vicinity [Member]
Multiemployer Plans [Line Items]
EIN	231511735
Plan Number	001
PPA Zone Status	Yellow	Yellow
FIP/RP Status Pending/ Implemented	Implemented
Surcharge Imposed	No
Expiration Dates	Oct. 02, 2018
Local 703 I.B. of T. Grocery and Food Employees Pension Plan [Member]
Multiemployer Plans [Line Items]
EIN	366491473
Plan Number	001
PPA Zone Status	Green	Green
FIP/RP Status Pending/ Implemented	NA
Surcharge Imposed	No
Expiration Dates	Jun. 30, 2018
United Teamsters Trust Fund A [Member]
Multiemployer Plans [Line Items]
EIN	135660513
Plan Number	001
PPA Zone Status	Yellow	Yellow
FIP/RP Status Pending/ Implemented	Implemented
Surcharge Imposed	No
Expiration Dates	May 30, 2019
Warehouse Employees Local 169 and Employers Joint Pension Fund [Member]
Multiemployer Plans [Line Items]
EIN	236230368
Plan Number	001
PPA Zone Status	Red	Red
FIP/RP Status Pending/ Implemented	Implemented
Surcharge Imposed	No
Expiration Dates	Feb. 10, 2018
Local 705 I.B. of T. Pension Trust Fund [Member]
Multiemployer Plans [Line Items]
EIN	366492502
Plan Number	001
PPA Zone Status	Red	Red
FIP/RP Status Pending/ Implemented	Implemented
Surcharge Imposed	No
Expiration Dates	Dec. 29, 2018

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation 12B
-Number 240
-Section 12b
-Subsection 1

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- Definition

Three digit plan number for 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 (b)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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- Definition

Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "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

Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, in CCYY-MM-DD format. 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 (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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- Definition

Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire first in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. 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 (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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- Definition

Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan that will expire last in a group of associated collective bargaining arrangements, in CCYY-MM-DD format. 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 (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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- Definition

Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for 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. The acceptable values are "no", "pending", "implemented", "other", and "NA".

+ 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 (f)(1)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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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

Indicate whether the employer paid a surcharge to the 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. The acceptable values are "no", "yes", and "NA".

+ 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 (f)(2)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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