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Investments - Other-than-Temporary Impairments (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Other-than-temporary impairments recognized in net income:    
Total other-than-temporary impairments $ 0.5 $ 13.2
Corporates [Member]
   
Other-than-temporary impairments recognized in net income:    
Total other-than-temporary impairments   0.7
Non-agency residential mortgage-backed securities [Member]
   
Other-than-temporary impairments recognized in net income:    
Total other-than-temporary impairments 0.5 2.8
Hybrids [Member]
   
Other-than-temporary impairments recognized in net income:    
Total other-than-temporary impairments   $ 9.7