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Goodwill and Intangibles, including DAC and VOBA - Summary of Amortization Expense of Definite Lived Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Finite Lived Intangible Assets Amortization Expense [Line Items]    
Amortization expense related to intangibles $ 86.6 $ 56.7
Customer relationships [Member]
    
Finite Lived Intangible Assets Amortization Expense [Line Items]    
Amortization expense related to intangibles 10.4 9.6
Trade names [Member]
    
Finite Lived Intangible Assets Amortization Expense [Line Items]    
Amortization expense related to intangibles 3.6 3.1
Technology assets [Member]
    
Finite Lived Intangible Assets Amortization Expense [Line Items]    
Amortization expense related to intangibles $ 3.1 $ 1.9