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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions									1 Months Ended		3 Months Ended									9 Months Ended		12 Months Ended
	Nov. 09, 2016	May 29, 2015	Dec. 24, 2014	Feb. 26, 2014	Nov. 14, 2013	Oct. 31, 2013	Feb. 14, 2013	Feb. 29, 2012	Aug. 01, 2012	Dec. 10, 2007	Sep. 24, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Dec. 27, 2014	Mar. 29, 2014	Dec. 28, 2013	Dec. 25, 2010	Jul. 01, 2015	Jun. 27, 2015	Sep. 24, 2016	Sep. 26, 2015	Sep. 27, 2014	Aug. 01, 2015	Jul. 02, 2015	Nov. 18, 2010
Debt Instrument [Line Items]
Debt extinguishment loss											$ 800,000	$ 4,500,000		$ (37,800,000)	$ 18,200,000	$ 6,700,000						$ 5,300,000	$ 62,700,000	$ 7,400,000
Payments of Debt Issuance Costs																						0	22,700,000	2,400,000
Non-cash interest expense amortization of debt discount and deferred financing costs																						52,100,000	63,800,000	68,700,000
Repayments of Convertible Debt																						392,800,000	543,700,000	0
Principal Amount Of Borrowings											1,000,000,000											1,000,000,000
Convertible Notes Payable, Current											$ 12,200,000			141,800,000								12,200,000	141,800,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt																						$ (94,400,000)	(216,900,000)
Failure To Comply With Reporting Obligations Penalty Fee Percentage Of Convertible Notes											0.25%											0.25%
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Maximum Number of Shares											29.6											29.6
Period To Remedy Event Of Default For Failure To Comply With Reporting Obligations Of Convertible Notes																						90 days
Amount Repaid Under Revolver																						$ 175,000,000
Long-term Debt, Current Maturities											$ 296,000,000			391,200,000								296,000,000	391,200,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Proceeds under credit agreement		$ 1,680,000,000
Debt extinguishment loss															$ 18,200,000
Number of Debt Instruments															2
Direct Third Party Costs Interest Expense															$ 4,600,000
Payments of Debt Issuance Costs															3,800,000
Fees recorded as debt discount															$ 4,900,000
Maximum Range Of Present Value Of Cash Flow Percentage															10.00%
Interest expense																						40,400,000	75,300,000	54,700,000
Non-cash interest expense amortization of debt discount and deferred financing costs																						4,400,000	$ 9,000,000	$ 12,700,000
Notes principal amount									$ 2,800,000,000
Principal Amount Of Borrowings									2,500,000,000		1,410,000,000											$ 1,410,000,000
Net Proceeds From Debt Offering									$ 2,410,000,000
Line of Credit Facility, Interest Rate During Period																						2.08%	2.43%	2.89%
Leverage Ratio Maximum																						5.50
Decreased Net Leverage Ratio Pursuant To Senior Secured Credit Facility																						4.00
Interest Coverage Ratio																						3.75
Credit Agreement [Member] | Percentage Added to Eurodollar Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate During Period																						2.05%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt extinguishment loss											$ 22,300,000
Interest expense																						$ 56,016,000	$ 67,247,000	$ 64,000,000
Non-cash interest expense amortization of debt discount and deferred financing costs																						$ 3,804,000	$ 2,138,000	1,700,000
Debt Instrument, Interest Rate During Period																				6.25%
Long Term Debt Obligations Without Convertible Notes																										$ 1,000,000,000
Final interest payment																									$ 31,250,000
2022 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity Period																							2022
Debt Instrument, Interest Rate During Period																							5.25%
Long Term Debt Obligations Without Convertible Notes																										$ 1,000,000,000
Offering Price Of Principal Amount																										100.00%
Debt Instrument Maximum Percentage Of Redemption Of Senior Notes																										35.00%
Debt Instrument Percentage Of Redemption Price																										100.00%
Debt Instrument Percentage Of Redemption Price Second Period																										105.25%
Debt Instrument Percentage Of Redemption Price Third Period																										102.625%
Debt Instrument Percentage Of Redemption Price Fourth Period																										101.313%
Debt Instrument Percentage Of Redemption Price Fifth Period																										100.00%
Percentage Price Of Principal Amount For Repurchase Of Senior Note Change In Control											101.00%
Convertible Notes [Member]
Debt Instrument [Line Items]
Debt extinguishment loss											$ 15,500,000
Gains (Losses) on Recourse Debt											(14,400,000)
Debt Instrument, Maturity Date Range, Start																						Dec. 15, 2017
Redemption Price As Percentage Of Principal Amount Plus Accrued And Unpaid Interest																						100.00%
Cash Per Original Principle Amount Of Exchange Notes																						$ 1,000
Convertible Notes Issuance Expense																						4,100,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt											246,100,000											$ 32,500,000
Write off of Deferred Debt Issuance Cost											700,000
Allocated Third Party Costs											$ 400,000
Debt Instrument Nonconvertible Effective Interest Rate											2.71%
Deferred Taxes, Reacquisition of Equity Component											$ 29,200,000
Convertible Notes [Member] | 2007 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										2.00%
Notes principal amount					$ 405,000,000		$ 370,000,000	$ 500,000,000		$ 1,725,000,000																	$ 450,000,000
Convertible Notes [Member] | Two Thousand Thirteen Original Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage											2.00%											2.00%
Exceeds Percentage Of Accreted Principal Amount Of Original Notes																						120.00%
Principal Convertible To Common Stock																						$ 1,000,000
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Interest expense																						1,000,000
Principal Amount Of Borrowings											$ 200,000,000											$ 200,000,000
Line of Credit Facility, Interest Rate During Period																						0.00%
Term AR Securitization Program																						1 year
Accounts Receivable from Securitization											200,000,000											$ 200,000,000
Debt Instrument, Description of Variable Rate Basis																						0.007
Accounts Receivable Securitization [Member] | Maximum [Member]
Debt Instrument [Line Items]
Accounts Receivable from Securitization											200,000,000											$ 200,000,000
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate During Period																						1.22%
Long-term Debt, Current Maturities											$ 200,000,000			$ 0								$ 200,000,000	$ 0
Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Debt extinguishment loss												(4,500,000)										(5,300,000)
Interest expense																						50,000,000	70,700,000	76,600,000
Non-cash interest expense amortization of debt discount and deferred financing costs																						$ 40,000,000	$ 52,500,000	$ 54,300,000
Debt Instrument, Interest Rate, Stated Percentage											2.00%			2.00%								2.00%	2.00%
Term Loan [Member]
Debt Instrument [Line Items]
Long Term Debt Obligations Without Convertible Notes											$ 1,308,200,000			$ 1,388,300,000								$ 1,308,200,000	$ 1,388,300,000
Long-term Debt, Current Maturities											83,800,000			74,400,000								83,800,000	74,400,000
Term Loan [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity											1,500,000,000											$ 1,500,000,000
Debt Instrument, Maturity Date																						May 29, 2020
Term Loan [Member] | Credit Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instruments Principal Repayment Due Per Quarter																						$ 18,750,000
Term Loan [Member] | Credit Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instruments Principal Repayment Due Per Quarter																						37,500,000
Revolver [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities											0			175,000,000								0	175,000,000
Revolver [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity											$ 1,000,000,000											$ 1,000,000,000
Debt Instrument, Maturity Date																						May 29, 2020
Amount borrowed under revolver		$ 175,000,000
Wholly owned foreign subsidiary borrowing limit		100,000,000
Term Loan A [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,000,000,000
Debt Instrument, Maturity Date																					Aug. 01, 2017
Revolving Credit Facility [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		300,000,000
Debt Instrument, Maturity Date																					Aug. 01, 2017
Term Loan B [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,500,000,000
Debt Instrument, Maturity Date																					Aug. 01, 2019
Prepaid principal amount			$ 300,000,000	$ 25,000,000		$ 100,000,000
Debt extinguishment loss													$ (6,700,000)				$ 4,400,000	$ 2,900,000
Number of Debt Instruments				2
Direct Third Party Costs Interest Expense																	$ 1,000,000
Maximum Range Of Present Value Of Cash Flow Percentage				10.00%
2007 Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity Period										2037
November Eighteen Two Thousand Ten Original Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																											2.00%
Debt Instrument Maturity Period																			2037
Notes principal amount																											$ 450,000,000
November Eighteen Two Thousand Ten Original Notes [Member] | Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Notes principal amount												90,000,000
February Twenty Nine Two Thousand Twelve Original Notes [Member]
Debt Instrument [Line Items]
Convertible Notes, Triggering Events											$ 0											$ 0
February Twenty Nine Two Thousand Twelve Original Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								2.00%
Debt Instrument Maturity Period								2042
Notes principal amount								$ 500,000,000
Two Thousand Seven Original Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Debt Instrument Repurchase Price Percentage Of Principle Amount					100.00%
Debt Instrument Convertible Effective Interest Rate One																						3.25%
Two Thousand Twelve Original Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage											2.00%											2.00%
Annual Yield To Maturity On Convertible Notes																						2.00%
Exceeds Percentage Of Accreted Principal Amount Of Original Notes																						120.00%
Exceeds Percentage Of Conversion Price Of Common Stock																						130.00%
Number Of Trading Days Considered For Average Closing Daily Prices Description																						During the five business day period after any five consecutive trading day period
Percentage To Compare Note Price To Product Of Common Stock And Conversion Rate																						98.00%
Principal Convertible To Common Stock																						$ 1,000,000
Two Thousand Twelve Original Notes [Member] | Convertible Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Number Of Trading Days																						20 days
Two Thousand Twelve Original Notes [Member] | Convertible Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Number Of Trading Days																						30 days
Due December Two Zero One Seven [Member] | Convertible Notes [Member] | Two Thousand Thirteen Original Notes [Member]
Debt Instrument [Line Items]
Annual Yield To Maturity On Convertible Notes																						4.00%
Thereafter [Member] | Convertible Notes [Member] | Two Thousand Thirteen Original Notes [Member]
Debt Instrument [Line Items]
Annual Yield To Maturity On Convertible Notes																						2.00%
Two Thousand Thirteen Original Notes [Member]
Debt Instrument [Line Items]
Maximum Range Of Present Value Of Cash Flow Percentage																						10.00%
Change In Fair Value Of Conversion Option Percentage																						10.00%
Two Thousand Thirteen Original Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Exceeds Percentage Of Conversion Price Of Common Stock																						130.00%
Number Of Trading Days Considered For Average Closing Daily Prices Description																						During the five business day period after any five consecutive trading day period
Percentage To Compare Note Price To Product Of Common Stock And Conversion Rate																						98.00%
Convertible Notes, Triggering Events											$ 0											$ 0
Debt Instrument Convertible Effective Interest Rate One																						5.42%
Gains Losses On Exchange Of Debt																						$ 0
Two Thousand Thirteen Original Notes [Member] | Convertible Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Number Of Trading Days																						20 days
Two Thousand Thirteen Original Notes [Member] | Convertible Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Number Of Trading Days																						30 days
February Fourteen Two Thousand And Thirteen Original Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							2.00%
Debt Instrument Maturity Period							2043
Notes principal amount							$ 370,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate redemption price																									1,030,000,000
Premium payment																									$ 31,250,000
Two Thousand Ten Original Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Debt extinguishment loss											$ (800,000.0)			(15,500,000.0)
Principle Convertible Debt Put During Period											$ 1,300,000.0
Debt Instrument, Interest Rate, Stated Percentage											2.00%											2.00%
Notes principal amount											$ 46,300,000.0			300,000,000.0								$ 46,300,000.0	300,000,000.0
Repayments of Convertible Debt											79,200,000.0			$ 543,700,000.0
Amount by which the if-converted value exceeds the principal amount											7,900,000.0											$ 7,900,000.0
Annual Yield To Maturity On Convertible Notes																						2.00%
Exceeds Percentage Of Accreted Principal Amount Of Original Notes																						120.00%
Conversion Of Notes Into Shares Conversion Price																						$ 23.03
Exceeds Percentage Of Conversion Price Of Common Stock																						130.00%
Convertible Notes Payable, Current											$ 12,200,000.0											$ 12,200,000.0
Number Of Trading Days Considered For Average Closing Daily Prices Description																						during the five business day period after any five consecutive trading day period
Percentage To Compare Note Price To Product Of Common Stock And Conversion Rate																						98.00%
Principal Convertible To Common Stock																						$ 1,000
Two Thousand Ten Original Notes [Member] | Convertible Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Number Of Trading Days											20 days											20 days
Two Thousand Ten Original Notes [Member] | Convertible Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Number Of Trading Days											30 days											30 days
Two Thousand Ten Original Notes [Member] | Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Gains (Losses) on Recourse Debt																						$ 4,000,000
Repayments of Convertible Debt												$ 140,100,000
Conversion Of Notes Into Shares Conversion Price												$ 0
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt																						83,700,000
Write off of Deferred Debt Issuance Cost																						400,000
Allocated Third Party Costs																						200,000
Debt Instrument Nonconvertible Effective Interest Rate												2.71%
Deferred Taxes, Reacquisition of Equity Component																						15,700,000
Two Thousand Ten Original Notes [Member] | Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Debt extinguishment loss																						$ (4,600,000)
Two Thousand And Twelve Notes [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Conversion Of Notes Into Shares Conversion Price																						$ 31.175
Two Thousand And Twelve Notes [Member] | Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Debt extinguishment loss																						$ (700,000)
Notes principal amount												$ 136,600,000
Repayments of Convertible Debt												$ 171,300,000
Conversion Of Notes Into Shares Conversion Price												$ 0
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt																						38,900,000
Write off of Deferred Debt Issuance Cost																						500,000
Allocated Third Party Costs																						200,000
Deferred Taxes, Reacquisition of Equity Component																						$ 12,500,000
Year Two Thousand Thirteen [Member] | Convertible Notes [Member]
Debt Instrument [Line Items]
Conversion Of Notes Into Shares Conversion Price																						$ 38.59
Other Current Assets [Member]
Debt Instrument [Line Items]
Debt Issuance Cost																							600,000
Debt [Member]
Debt Instrument [Line Items]
Debt Issuance Cost																							27,600,000
Other Noncurrent Assets [Member]
Debt Instrument [Line Items]
Debt Issuance Cost																							$ 27,000,000
First Valuation Date [Member] | Two Thousand And Twelve Notes [Member] | Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Debt Instrument Nonconvertible Effective Interest Rate												3.87%
Second Valuation Date [Member] | Two Thousand And Twelve Notes [Member] | Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Debt Instrument Nonconvertible Effective Interest Rate												3.41%
Subsequent Event [Member]
Debt Instrument [Line Items]
Redemption Price As Percentage Of Principal Amount Plus Accrued And Unpaid Interest	100.00%

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