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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended
	Jul. 01, 2017	Dec. 31, 2016	Jun. 25, 2016	Mar. 26, 2016	Jul. 01, 2017	Jun. 25, 2016	Dec. 19, 2016	Sep. 24, 2016
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 100.0				$ 100.0
Repayments of Convertible Debt	269.1	$ 12.3			290.1	$ 311.5
Debt Instrument, Convertible, Conversion Price				$ 23.03
Accretion Expense	18.5
Debt extinguishment loss	(2.6)		$ 0.0	$ 4.5	(2.6)	(4.5)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	51.6		88.8
Deferred Taxes, Reacquisition of Equity Component	23.5		$ 22.5
Current debt obligations, net of debt discount	1,013.3				1,013.3			$ 296.0
Convertible Notes	576.4				576.4			12.2
Convertible Notes	0.0				0.0			763.5
Total long-term debt obligations	2,207.6				2,207.6			3,049.4
Total debt obligations	3,220.9				3,220.9			3,345.4
Term Loan [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	111.9				111.9			83.8
Long-term debt obligations, net of debt discount	1,227.0				1,227.0			1,308.2
Revolver [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	125.0				125.0			0.0
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	200.0				200.0			200.0
2022 Notes [Member]
Debt Instrument [Line Items]
Long-term debt obligations, net of debt discount	980.6				980.6			$ 977.7
Revolver [Member]
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	$ 125.0				$ 125.0
Two Thousand And Twelve Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				136.6
Repayments of Convertible Debt				$ 171.3
Debt Instrument, Convertible, Conversion Price	$ 31.175			$ 31.175	$ 31.175
Two Thousand And Twelve Notes [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Stated interest rate							2.00%
2013 Notes
Debt Instrument [Line Items]
Debt Instrument, Convertible, Conversion Price	$ 38.59				$ 38.59
2013 Notes | Convertible Debt [Member]
Debt Instrument [Line Items]
Stated interest rate							2.00%
2010 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 90.0
Repayments of Convertible Debt				$ 140.1
2010 Notes [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Stated interest rate							2.00%
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Interest expense	$ 0.9				$ 2.3	$ 0.4

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