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Investments - Schedule of Allowance for Credit Losses (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Allowance for credit losses:    
Balance at beginning of period $ 1.4  
Provision for credit losses 1.2  
Charge-offs      
Recoveries      
Balance at end of period $ 2.6