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Schedule of Roll Forward of Amount Related to Credit Losses Recognized in Earnings (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Balance at beginning of period	$ 14.0
Accretion of impairments included in net income	(0.4)
Sale of investments	$ (13.6)

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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