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Shareholders' Equity - Share Repurchase Program (Details) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended	3 Months Ended	1 Months Ended
	Apr. 28, 2012	Apr. 30, 2011	Jan. 28, 2012	Apr. 28, 2012 Common Stock [Member]	May 31, 2011 2011 Repurchase Program [Member] Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 400,000,000
Stock Repurchased During Period, Shares				2,500
Stock Repurchased During Period, Value	$ 104,038,000	$ 4,626,000	$ 359,331,000	$ 98,500,000

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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