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Schedule of Funded Status of Defined Benefit Pension and Post-Retirement Benefit Plans (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Oct. 01, 2010
Defined Benefit Plan Disclosure [Line Items]      
Plan assets-end of fiscal year $ 142.6 $ 125.5  
Defined Benefit Plans
     
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation-beginning of fiscal year 160.5 141.1  
Service cost 4.3 3.7 2.4
Interest cost 5.3 5.0  
Plan participants' contributions 5.3 6.7  
Plan settlement (2.5) 0  
Plan curtailment (0.2) 0  
Actuarial (gain) loss 14.5 4.6  
Foreign currency changes (2.4) 5.4  
Benefit and expense payments (3.7) (6.0)  
Benefit obligation-end of fiscal year 181.1 160.5 141.1
Plan assets-beginning of fiscal year 125.5 113.1  
Employer contributions 9.6 7.4  
Actual return on plan assets 9.8 (0.1)  
Plan participants' contributions 5.3 6.7  
Plan settlement (2.5) 0  
Foreign currency changes (1.4) 4.4  
Benefit and expense payments (3.7) (6.0)  
Plan assets-end of fiscal year 142.6 125.5 113.1
Funded status (38.5) (35.0)  
Current liabilities 0 (0.1)  
Noncurrent liabilities (38.5) (34.9)  
Net amount recognized (38.5) (35.0)  
Post-Retirement Benefit Plans
     
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation-beginning of fiscal year 5.9 5.9  
Service cost 0 0 0
Interest cost 0.3 0.2  
Plan participants' contributions 0 0  
Plan settlement 0 0  
Plan curtailment 0 0  
Actuarial (gain) loss (0.1) 0.3  
Foreign currency changes 0 0  
Benefit and expense payments (0.5) (0.5)  
Benefit obligation-end of fiscal year 5.6 5.9 5.9
Plan assets-beginning of fiscal year 0 0  
Employer contributions 0.5 0.5  
Actual return on plan assets 0 0  
Plan participants' contributions 0 0  
Plan settlement 0 0  
Foreign currency changes 0 0  
Benefit and expense payments (0.5) (0.5)  
Plan assets-end of fiscal year 0 0 0
Funded status (5.6) (5.9)  
Current liabilities (0.5) (0.5)  
Noncurrent liabilities (5.1) (5.4)  
Net amount recognized $ (5.6) $ (5.9)