CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 01, 2012	Jan. 02, 2011	Jan. 03, 2010
Net actuarial (losses) gains, deferred income tax expense (benefit)	$ 49	$ (4,467)	$ 6,267
Actuarial loss reclassification, deferred income tax expense	1,636	7,645	10,875
Prior service credit, deferred income tax expense	2,015	979
Prior service credit reclassification, deferred income tax benefit	$ (10,998)	$ (1,590)	$ (1,591)