4. Employee Retirement Benefit Plans: Components of Net Periodic Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Pension Plans, Defined Benefit
Interest cost	$ 398	$ 467	$ 1,195	$ 1,402
Expected return on assets	(460)	(454)	(1,381)	(1,361)
Amortization of actuarial loss	177	171	531	511
Settlement charge		352		986
Net periodic benefit expense	115	536	345	1,538
Supplemental Executive Retirement Plan
Interest cost	41	52	123	155
Amortization of actuarial loss	17	14	51	42
Amortization of prior year service cost	(12)	(12)	(36)	(36)
Net periodic benefit expense	$ 46	$ 54	$ 138	$ 161