EMPLOYEE BENEFITS - Investmt assets (Details) (Pension plan, USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
Jan. 14, 2011 item	Dec. 28, 2014	Dec. 29, 2013
Changes in the fair value of the plan's Level 3 investment assets
Fair value of plan assets, end of year		$ 1,478,686	$ 1,426,678
Additional disclosures on plan assets
Number of locations from which properties were contributed	7
Level 3
Changes in the fair value of the plan's Level 3 investment assets
Fair value of plan assets, beginning of year		59,432	57,987
Purchases, issuances, sales, settlements		(3,312)
Realized gains		(12,180)	4,817
Transfer in or out of level 3		(4,456)	(4,984)
Unrealized gains		14,731	1,612
Fair value of plan assets, end of year		54,215	59,432
Real estate \| Level 3
Changes in the fair value of the plan's Level 3 investment assets
Fair value of plan assets, beginning of year		52,265	51,579
Purchases, issuances, sales, settlements		(3,312)
Realized gains		3,973	4,817
Transfer in or out of level 3		(3,973)	(4,817)
Unrealized gains		(1,374)	686
Fair value of plan assets, end of year		47,579	52,265
Private Equity
Additional disclosures on plan assets
Number of funds closed out		2
Private Equity \| Level 3
Changes in the fair value of the plan's Level 3 investment assets
Fair value of plan assets, beginning of year		7,167	6,408
Realized gains		(16,153)
Transfer in or out of level 3		(483)	(167)
Unrealized gains		16,105	926
Fair value of plan assets, end of year		$ 6,636	$ 7,167

Represents the total of the fair value of plan asset categories including pending trades.

No definition available.

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- Definition

The number of investment funds closed out during the period.

+ References

No definition available.

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- Definition

Represents the number of locations from which properties were contributed to the defined benefit plan.

+ References

No definition available.

+ Details

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- Definition

Actual return on plan assets, separately identifying the amount related to assets sold during the period.

+ 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)(iv)(02)(A)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(iv)(02)(A)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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- Definition

Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date.

+ References

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- Definition

Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations.

+ 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)(iv)(02)(B)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(iv)(02)(B)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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- Definition

Transfers in and out of Level 3. For example, transfers due to changes in the observability of significant inputs.

+ 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)(iv)(02)(C)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(iv)(02)(C)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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