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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 19, 2016
Dec. 31, 2016
Dec. 26, 2015
Debt Instrument [Line Items]      
Non-cash interest expense amortization of debt discount and deferred financing costs   $ 14.3 $ 13.2
Conversion requests remaining to be paid   8.4  
Cash paid for conversion of debt   6.4 0.1
Conversion premium   2.5  
Repayments of Accounts Receivable Securitization   $ 12.0 $ 0.0
Credit Agreement      
Debt Instrument [Line Items]      
Weighted average interest rates   2.05% 1.95%
Interest rate   2.27%  
Interest expense   $ 9.8 $ 10.0
Non-cash interest expense amortization of debt discount and deferred financing costs   1.1 1.1
2022 Notes [Member]      
Debt Instrument [Line Items]      
Interest expense   15.1  
Non-cash interest expense amortization of debt discount and deferred financing costs   $ 1.0  
Senior note interest rate per year   5.25%  
Senior Notes      
Debt Instrument [Line Items]      
Interest expense     14.0
Accounts Receivable Securitization [Member]      
Debt Instrument [Line Items]      
Weighted average interest rates   1.25%  
Interest rate   1.47%  
Interest expense   $ 0.7  
Repayments of Accounts Receivable Securitization   12.0  
Convertible Debt [Member] | 2010 Notes [Member]      
Debt Instrument [Line Items]      
Stated interest rate 2.00%    
Redemption price (as a percent) 100.00%    
Convertible Notes Payable [Member]      
Debt Instrument [Line Items]      
Interest expense   12.0 14.0
Non-cash interest expense amortization of debt discount and deferred financing costs   $ 10.0 $ 10.8