Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									6 Months Ended		12 Months Ended
	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Jul. 01, 2018	Jul. 03, 2016	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016	Jul. 27, 2016
Schedule of Stockholders' Equity [Line Items]
Stock repurchase program, number of shares authorized to be repurchased															8,000,000
Cash dividends (per share)		$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07	$ 0.07		$ 0.07	$ 0.28	$ 0.28
Aggregate cost of repurchased common stock to satisfy statutory tax withholding obligation requirements												$ 4,400	$ 3,600	$ 4,400
Number of common stock repurchased in open market												0
Stock repurchase program, number of shares remained available for repurchase		8,000,000										8,000,000
Repurchased shares of common stock to satisfy statutory tax withholding obligation requirements												78,644	75,198	95,129
Dividends accrued		$ 7,700										$ 7,700
Unrecognized prior service costs, net of tax												$ (77)	$ (860)	$ (316)
Dividends Payable, Date Declared		Oct. 27, 2017
Dividends Payable, Date to be Paid												Feb. 09, 2018
Subsequent Event [Member]
Schedule of Stockholders' Equity [Line Items]
Cash dividends (per share)	$ 0.07
Dividends Payable, Date Declared	Jan. 25, 2018
Dividends Payable, Date to be Paid										May 10, 2018