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Borrowings and Credit Arrangements - Interest Expense under Convertible Notes (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Debt Conversion [Line Items]    
Non-cash interest expense $ 14.3 $ 13.2
Convertible Notes Payable    
Debt Conversion [Line Items]    
Amortization of debt discount 5.2 6.4
Amortization of deferred financing costs 0.2 0.3
Principal accretion 4.6 4.1
Non-cash interest expense 10.0 10.8
2.00% accrued interest (cash) 2.0 3.2
Interest expense, net $ 12.0 $ 14.0