Stock Repurchase Programs (Details) (USD $)	1 Months Ended	3 Months Ended		1 Months Ended
	Jul. 31, 2014	Apr. 04, 2015	Mar. 29, 2014	Apr. 30, 2015	Aug. 31, 2008	Feb. 29, 2008
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 500,000,000	$ 500,000,000
Remaining number of shares authorized to be repurchased		677,500,000
Approved treasury stock repurchase, term	2 years
Treasury stock repurchase approved	300,000,000
Share Repurchased and Cost of Repurchased Shares [Abstract]
Shares repurchased		2,001,000	827,000
Total cost of repurchased shares		36,797,000	12,517,000
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Approved treasury stock repurchase, term				2 years
Treasury stock repurchase approved				$ 450,000,000