EMPLOYEE BENEFITS (Details 6) (Pension plans, USD $) In Thousands, unless otherwise specified			0 Months Ended			12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Jan. 14, 2011 Real Estate item	Dec. 30, 2012 Real Estate	Dec. 25, 2011 Real Estate	Dec. 30, 2012 Level 3	Dec. 25, 2011 Level 3	Dec. 30, 2012 Level 3 Real Estate	Dec. 25, 2011 Level 3 Real Estate	Dec. 30, 2012 Level 3 Private Equity	Dec. 25, 2011 Level 3 Private Equity	Dec. 25, 2011 Level 3 Receivable
Summary of changes in the fair value of the plan's Level 3 investment assets
Fair value of plan assets, beginning of year	$ 1,352,711	$ 1,255,822		$ 51,579	$ 50,530	$ 59,429	$ 36,728	$ 50,530		$ 8,899	$ 7,792	$ 28,936
Purchases, issuances, sales, settlements							20,774		49,710			(28,936)
Realized gains						3,774	3,472	3,747	3,472	27
Transfer in or out of level 3						(7,567)	(3,472)	(3,747)	(3,472)	(3,820)
Unrealized gains						2,351	1,927	1,049	820	1,302	1,107
Fair value of plan assets, end of year	$ 1,352,711	$ 1,255,822		$ 51,579	$ 50,530	$ 57,987	$ 59,429	$ 51,579	$ 50,530	$ 6,408	$ 8,899
Additional disclosures on plan assets
Number of locations from which properties were contributed			7