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Borrowings and Credit Arrangements - Interest Expense under Convertible Notes (Detail) - Convertible Notes Payable
$ in Millions
12 Months Ended
Sep. 29, 2018
USD ($)
Debt Conversion [Line Items]  
Amortization of debt discount $ 3.5
Amortization of deferred financing costs 0.2
Principal accretion 1.6
Non-cash interest expense 5.3
2.00% accrued interest 1.8
Interest expense, net $ 7.1