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Receivables (Detail) - USD ($)
$ in Millions
Sep. 28, 2018
Sep. 29, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade and unbilled receivable, gross $ 1,093.0 $ 1,039.2
Allowance for doubtful accounts (41.1) (63.1)
Trade and unbilled receivable, net 1,051.9 976.1
Short-term 1,009.9 961.5
Long-term (1) 42.0 14.6
Notes Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable 29.8 105.2
Short-term (2) 0.1 5.0
Long-term (1) (3) $ 29.7 $ 100.2