NATURE OF OPERATIONS AND ACCOUNTING POLICIES. (Details 5)	12 Months Ended
	Dec. 29, 2012 item
Partnership including four directors/stockholders
Property, Plant and Equipment
Number of directors/stockholders included as partners in partnership from whom facilities are leased	4
Land improvements
Property, Plant and Equipment
Useful life	22 years
Buildings
Property, Plant and Equipment
Useful life	40 years
Machinery and equipment | Minimum
Property, Plant and Equipment
Useful life	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Useful life	10 years
Leasehold improvements | Minimum | Partnership including four directors/stockholders
Property, Plant and Equipment
Useful life	15 years
Leasehold improvements | Maximum | Partnership including four directors/stockholders
Property, Plant and Equipment
Useful life	40 years