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Investments - Reconciliation of Other than Temporary Impairment on Fixed Maturity (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Balance at the beginning of the period $ 2.7 $ 0.7
Increases attributable to credit losses on securities:    
Other-than-temporary impairment was not previously recognized    1.5
Balance at the end of the period $ 2.7 $ 2.2