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Investments - Net Investment Income (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Schedule of Investments [Line Items]    
Gross investment income $ 182.1 $ 189.9
External investment expense (4.1) (3.1)
Net investment income 178.0 186.8
Fixed maturity available-for-sale securities [Member]
   
Schedule of Investments [Line Items]    
Gross investment income 167.6 187.2
Equity available-for-sale securities [Member]
   
Schedule of Investments [Line Items]    
Gross investment income 4.7 2.6
Policy loans [Member]
   
Schedule of Investments [Line Items]    
Gross investment income 0.3 0.3
Invested cash and short-term investments [Member]
   
Schedule of Investments [Line Items]    
Gross investment income 0.8 0.1
Other investments [Member]
   
Schedule of Investments [Line Items]    
Gross investment income $ 8.7 $ (0.3)