Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	6 Months Ended
	Jan. 28, 2016	Jan. 31, 2016	Jan. 31, 2016	May. 29, 2015
Stockholders' Equity Note [Abstract]
Number of shares authorized to be repurchased				14,000,000.0
Stock repurchased during the period (in shares)		0	2,070,000
Stock repurchased during the period, value			$ 68.0
Average price per share (in usd per share)			$ 32.85
Shares with remaining authorization for repurchase under stock repurchase plan (in shares)		10,900,000.0	10,900,000.0
Cash dividend declared per common share (in usd per share)	$ 0.170