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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 12 Months Ended
Sep. 24, 2016
USD ($)
Lease
term
Sep. 26, 2015
USD ($)
Sep. 27, 2014
USD ($)
Contingent Consideration Earn-Out Payments [Line Items]      
Accrued expenses $ 287.6 $ 272.1  
Operating Lease Expiration Year 2035    
Rent Expense Net Of Sublease Income $ 17.9 19.2 $ 21.1
Operating Leases, Rent Expense, Sublease Rentals $ 2.4 $ 2.0 $ 1.8
Minimum [Member]      
Contingent Consideration Earn-Out Payments [Line Items]      
Royalty Based On Revenue Lower Range Percentage 1.00%    
Maximum [Member]      
Contingent Consideration Earn-Out Payments [Line Items]      
Royalty Based On Revenue Upper Range Percentage 35.00%    
Finance Leases [Member]      
Contingent Consideration Earn-Out Payments [Line Items]      
Number Of Finance Leases | Lease 2    
Property, Plant, and Equipment, Fair Value Disclosure $ 28.3    
Finance Lease Extension Executed 1    
Finance Lease Expiration Year 2024    
Accrued expenses $ 2.9    
Accrued lease obligation-long-term $ 34.8    
Optional Lease Extension Period 10 years    
Number Of Optional Lease Extensions | term 2    
Lease Extension Period 5 years    
Finance Lease 2 [Member]      
Contingent Consideration Earn-Out Payments [Line Items]      
Optional Lease Extension Period 8 years    
Number Of Optional Lease Extensions | term 1    
Lease Extension Period 5 years    
Finance Leases [Member] | Leasehold Improvements [Member]      
Contingent Consideration Earn-Out Payments [Line Items]      
Property, Plant and Equipment, Useful Life 35 years