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Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	6 Months Ended
	Sep. 06, 2018	Aug. 04, 2018	Jul. 29, 2017	May 05, 2018	Feb. 03, 2018	Oct. 28, 2017	Apr. 29, 2017	Apr. 30, 2016
Shares Repurchased		5,065	2,656
Amount Repurchased		$ 186.0	$ 132.0
March 2018 Repurchase Program [Member]
Amount Authorized				$ 250.0
Shares Repurchased		4,538
Amount Repurchased		$ 161.0
Average Stock Price of Shares Repurchased within Program		$ 35.53
Remaining authorized repurchase amount		$ 89.0
September 2017 Repurchase Program [Member]
Amount Authorized						$ 250.0
Shares Repurchased		527
Amount Repurchased		$ 25.0
Average Stock Price of Shares Repurchased within Program		$ 46.98
Remaining authorized repurchase amount				$ 23.0
February 2017 Repurchase Program [Member]
Amount Authorized							$ 250.0
Shares Repurchased			2,605
Amount Repurchased			$ 129.0
Average Stock Price of Shares Repurchased within Program			$ 49.58
Remaining authorized repurchase amount						$ 10.0
February 2016 Repurchase Program [Member]
Amount Authorized								$ 500.0
Shares Repurchased			51
Amount Repurchased			$ 3.0
Average Stock Price of Shares Repurchased within Program			$ 58.95
Remaining authorized repurchase amount							$ 59.0
June 2015 Repurchase Program [Member]
Remaining authorized repurchase amount								$ 17.0
Accounts Payable [Member] | March 2018 Repurchase Program [Member]
Share repurchase reflected in Accounts payable		$ 2.0
Accounts Payable [Member] | September 2017 Repurchase Program [Member]
Share repurchase reflected in Accounts payable					$ 2.0
Accounts Payable [Member] | February 2017 Repurchase Program [Member]
Share repurchase reflected in Accounts payable			$ 3.0
Subsequent Event [Member] | March 2018 Repurchase Program [Member]
Shares Repurchased	300
Amount Repurchased	$ 10.0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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-Publisher FASB
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-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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