For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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-Name Accounting Standards Codification
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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Retirement plan expenses	$ 10,500,000	$ 5,900,000	$ 7,500,000
Accumulated benefit obligation, defined benefit pension plans	166,000,000	190,000,000
Actuarial loss expected to be recognized in net pension cost throughout 2015	$ 700,000
Maximum annual contribution per employee, percent	30.00%
Maximum annual contribution per employee, amount	$ 245,000
Expenses related to defined contribution plans	$ 4,800,000	$ 3,900,000	$ 3,900,000
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Matching contribution, percent of employees' salary	2.14%
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Matching contribution, percent of employees' salary	6.00%
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Expected contributions during 2015	$ 10,800,000
Other Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Expected contributions during 2015	$ 100,000
Fixed income securities [Member] \| Pooled separate accounts [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Target plan asset allocations	50.00%
Fixed income securities [Member] \| Common collective trusts funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Target plan asset allocations	30.00%
Equity securities [Member] \| Pooled separate accounts [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Target plan asset allocations	50.00%
Equity securities [Member] \| Common collective trusts funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Target plan asset allocations	70.00%