Stockholders' Equity Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended
	Aug. 24, 2014	Aug. 25, 2013	Jul. 31, 2014 Accelerated Share Repurchase Program	Aug. 24, 2014 Accelerated Share Repurchase Program	Oct. 31, 2014 Scenario, Forecast Accelerated Share Repurchase Program
Class of Stock [Line Items]
Share repurchase program, authorized amount			$ 500.0
Payments For Accelerated Share Repurchase Program	500.0	0		500.0
Stock to be repurchased and retired				0	8,600,000
Shares repurchased (as a percentage)			80.00%
Accelerated share repurchase program reduction to shareholders' equity	$ 500.0			$ 500.0