Consolidated Statements of Equity (Parentheticals) - USD ($)	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 27, 2014
Treasury Stock [Member]
Shares withheld on restricted stock grants for withholding taxes (in shares)	31,040	28,286	19,439
Purchase of common stock, shares (in shares)		350,000	161,751
Treasury stock, retired (in shares)		214,609
Common Stock [Member]
Stock options exercised, tax impact	$ (7,400,000)	$ (2,485,000)	$ 2,143,000
Retained Earnings [Member]
Cash dividends paid, per share (in dollars per share)	$ 1.24	$ 1.08	$ 0.94
AOCI Attributable to Parent [Member]
Reclassification of pension settlement costs to expense, tax		$ (11,742)
Pension and postemployment reclassification adjustments, tax	$ 0	$ (746,000)
Purchase of common stock, shares (in shares)		350,000
Reclassification of pension settlement costs to expense, tax	0	$ 11,742,000	$ 0
Pension and postemployment reclassification adjustments, tax	$ 0	$ 746,000	$ 0