Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended
	Oct. 31, 2014	Sep. 25, 2013	Nov. 21, 2014 Subsequent Event [Member]
Class of Stock [Line Items]
Common stock authorized for repurchase		15,000,000
Stock repurchased during the period, shares	3,342,000
Stock repurchased during the period, value	$ 134.3
Average price per share	$ 40.20
Shares with remaining authorization for repurchase under stock repurchase plan	5,200,000
Cash dividend declared per common share			$ 0.165