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Stock Repurchase Program - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended	23 Months Ended
	Nov. 30, 2010	Oct. 02, 2011	Oct. 02, 2011	Sep. 30, 2012
Stock Repurchase Program
Stock repurchase program, authorized amount	$ 200
Repurchase of stock, shares		2.0	2.0	2.6
Repurchase of stock, value		$ 23.9	$ 23.9	$ 31.2
Common stock average price		$ 12.06	$ 12.06	$ 11.84

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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