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Investments - Schedule of Credit Quality of Asset-Based Loan Portfolio (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 30, 2012
Sep. 30, 2012
Asset-based loans, by credit quality rating    
Total asset-backed loans $ 207.4 $ 181.5
Total asset-backed loans, percent 100.00% 100.00%
Asset-based loans, by credit quality Rating 1 [Member] | Credit Rating AAA/AA/A [Member]
    
Asset-based loans, by credit quality rating    
Total asset-backed loans 18.1 75.8
Total asset-backed loans, percent 8.70% 41.70%
Asset-based loans, by credit quality Rating 2 [Member] | Credit Rating BBB [Member]
    
Asset-based loans, by credit quality rating    
Total asset-backed loans 165.9 94.9
Total asset-backed loans, percent 80.00% 52.30%
Asset-based loans, by credit quality Rating 3 [Member] | Credit Rating B [Member]
    
Asset-based loans, by credit quality rating    
Total asset-backed loans   10.8
Total asset-backed loans, percent   6.00%
Asset-based loans, by credit quality Rating 4 [Member] | Credit Rating B [Member]
    
Asset-based loans, by credit quality rating    
Total asset-backed loans      
Total asset-backed loans, percent      
Asset-based loans, by credit quality Rating 5 [Member] | Credit Rating CCC [Member]
    
Asset-based loans, by credit quality rating    
Total asset-backed loans 23.4   
Total asset-backed loans, percent 11.30%   
Not Rated [Member]
    
Asset-based loans, by credit quality rating    
Total asset-backed loans      
Total asset-backed loans, percent