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Equity - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Sep. 22, 2011	Oct. 29, 2011
Stockholders Equity Note [Line Items]
Purchases of common stock, shares		1.1
Share repurchase program authorized amount	$ 100
Purchases of common stock		28.7
Stock repurchase program remaining authorized repurchase amount	$ 127.1	$ 98.4

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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