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Cash Proceeds and Intrinsic Value Related to Total Stock Options Exercised (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2012 | Oct. 02, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Proceeds from stock options exercised | $ 0.3 | $ 2.6
Intrinsic value of stock options exercised | $ 0.3 | $ 5.9

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