Stockholders' Equity (Details) - Range [Domain] - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 21, 2015	Jun. 30, 2015	Jul. 01, 2014	Jun. 30, 2015	Jul. 01, 2014	Mar. 31, 2015	Dec. 30, 2014	Jul. 31, 2013
Stockholders' Equity
Cash dividends declared per common share (in dollars per share)	$ 0.165	$ 0.165	$ 0.14	$ 0.33	$ 0.28
Stockholders Equity:
Repurchased shares since program inception		43,654,575		43,654,575			41,919,312
Value of shares repurchased since program inception		$ 1,242,849		$ 1,242,849			$ 1,158,652
Treasury stock repurchased during period				$ 84,197
Treasury Stock
Stockholders Equity:
Additional number of shares authorized to repurchase								7,500,000
Number of shares authorized to be repurchased								48,500,000
Repurchased shares since program inception		43,700,000		43,700,000
Value of shares repurchased since program inception						$ 1,242,800
Shares repurchased during period		100,000
Treasury stock repurchased during period		$ 3,800