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Goodwill and Intangibles, including DAC and VOBA - Summary of Definite Lived Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 30, 2012
Sep. 30, 2012
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Cost $ 1,218.8 $ 1,038.0
Accumulated Amortization 184.7 164.1
Net 1,034.1 873.9
Customer relationships [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Cost 875.5 796.2
Accumulated Amortization 127.0 113.0
Net 748.5 683.2
Intangible assets, Amortizable Life 20 years  
Trade names [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Cost 165.9 150.8
Accumulated Amortization 31.9 28.3
Net 134.0 122.5
Technology assets [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Cost 177.4 91.0
Accumulated Amortization 25.8 22.8
Net $ 151.6 $ 68.2
Minimum [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible assets, Amortizable Life 1 year  
Minimum [Member] | Customer relationships [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible assets, Amortizable Life 15 years  
Minimum [Member] | Trade names [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible assets, Amortizable Life 1 year  
Minimum [Member] | Technology assets [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible assets, Amortizable Life 4 years  
Maximum [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible assets, Amortizable Life 20 years  
Maximum [Member] | Customer relationships [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible assets, Amortizable Life 20 years  
Maximum [Member] | Trade names [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible assets, Amortizable Life 12 years  
Maximum [Member] | Technology assets [Member]
    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]    
Intangible assets, Amortizable Life 17 years