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Defined Benefit Plans - Components of Consolidated Net Periodic Benefit and Deferred Compensation Benefit Costs and Contributions Made (Detail) (Net periodic benefit cost [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 30, 2012
Jan. 01, 2012
Net periodic benefit cost [Member]
   
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Service cost $ 0.8 $ 0.6
Interest cost 2.6 2.2
Expected return on assets (2.5) (1.5)
Recognized net actuarial loss 0.5  
Employee contributions      
Net periodic benefit expense 1.4 1.3
Contributions made during period $ 0.7 $ 0.9