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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions									1 Months Ended	3 Months Ended									6 Months Ended	9 Months Ended		12 Months Ended
	Nov. 14, 2017	Oct. 10, 2017	Dec. 19, 2016	Nov. 09, 2016	May 29, 2015	Dec. 24, 2014	Feb. 14, 2013	Feb. 29, 2012	Dec. 10, 2007	Sep. 30, 2017	Jul. 01, 2017	Dec. 31, 2016	Sep. 24, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Dec. 25, 2010	Apr. 01, 2017	Jul. 01, 2015	Jun. 27, 2015	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015	Oct. 31, 2017	Apr. 21, 2017	Aug. 01, 2015	Jul. 02, 2015	Aug. 01, 2012	Nov. 18, 2010
Debt Instrument [Line Items]
Notes principal amount											$ 100,000,000
Amount borrowed under revolver										$ 345,000,000												$ 345,000,000
Non-cash interest expense amortization of debt discount and deferred financing costs																						49,400,000	$ 52,100,000	$ 63,800,000
Debt extinguishment loss										(600,000)	2,600,000		$ 800,000	$ 4,500,000								3,200,000	5,300,000	62,700,000
Payment of debt issuance costs																						0	0	(22,700,000)
Repurchase of common stock										200,100,000												200,100,000
Amount repaid under revolver																						175,000,000
Principal amount of borrowings										$ 1,000,000,000												1,000,000,000
Repayments of convertible debt											269,100,000	$ 12,300,000										396,200,000	392,800,000	543,700,000
Conversion premium																			$ 8,700,000
Adjustments to APIC, equity component of convertible debt																						$ (33,900,000)	$ (94,400,000)	$ (216,900,000)
Penalty fee percentage										0.25%												0.25%
Maximum number of shares subject to mandatory redemption (in shares)										18.0												18.0
Period to remedy event of default																						90 days
Accretion expense											$ 18,500,000
2013 Notes
Debt Instrument [Line Items]
Notes principal amount										$ 68,000,000												$ 68,000,000
Debt extinguishment loss																						$ (2,300,000)
Repayments of convertible debt										82,900,000
Conversion price (in dollars per share)											$ 38.590
Accretion expense										13,300,000
Credit Agreement
Debt Instrument [Line Items]
Notes principal amount																													$ 2,800,000,000
Proceeds under credit agreement					$ 1,680,000,000
Credit agreement interest rate																						2.39%	2.08%	2.43%
Interest expense																						$ 42,300,000	$ 40,400,000	$ 54,700,000
Non-cash interest expense amortization of debt discount and deferred financing costs																						$ 4,200,000	4,400,000	9,000,000
Leverage ratio maximum																						5.50
Interest coverage ratio																						3.75
Decreased net leverage ratio																						4.00
Debt extinguishment loss																	$ 18,200,000
Number of debt instruments																	2
Maximum range of present value of cash flow, percentage																	10.00%
Third-party costs																	$ 4,600,000
Payment of debt issuance costs																	(3,800,000)
Fees recorded as debt discount																	$ 4,900,000
Principal amount of borrowings										$ 1,670,000,000												$ 1,670,000,000							$ 2,500,000,000
Credit Agreement | Percentage Added to Eurodollar Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate					1.50%
Term Loan
Debt Instrument [Line Items]
Credit agreement interest rate																						2.73%
Senior Notes
Debt Instrument [Line Items]
Interest expense																						$ 57,300,000	56,000,000	67,200,000
Non-cash interest expense amortization of debt discount and deferred financing costs																						3,900,000	$ 3,800,000	2,100,000
Debt extinguishment loss													$ 22,300,000
Interest rate during period																				6.25%
Long-term debt obligations																												$ 1,000,000,000
Final interest payment																											$ 31,250,000
2022 Notes [Member]
Debt Instrument [Line Items]
Interest rate during period																							5.25%
Long-term debt obligations																												$ 1,000,000,000
Offering price, percentage of principal amount																												100.00%
Debt instrument, maturity period																							2022
Percentage of redemption price																												100.00%
Maximum percentage of redemption of senior notes																												35.00%
Percentage of redemption price, second period																												105.25%
Percentage of redemption price, third period																												102.625%
Percentage of redemption price, fourth period																												101.313%
Percentage of redemption price, fifth period																												100.00%
Percentage price of principal amount for repurchase of senior note													101.00%
Convertible Notes
Debt Instrument [Line Items]
Debt extinguishment loss													$ 15,500,000
Deferred taxes, reacquisition of equity component													29,200,000
Cash per original principle amount																						$ 1,000
Adjustments to APIC, equity component of convertible debt													246,100,000
Convertible Notes | 2007 Notes [Member]
Debt Instrument [Line Items]
Notes principal amount							$ 370,000,000	$ 500,000,000	$ 1,725,000,000																					$ 450,000,000
Interest rate									2.00%
Convertible Notes | Two Thousand Thirteen Original Notes [Member]
Debt Instrument [Line Items]
Interest rate										2.00%												2.00%
Exceeds percentage of accreted principle amount																						120.00%
Principal convertible to common stock																						$ 1,000,000
Securitization Program
Debt Instrument [Line Items]
Credit agreement interest rate																						0.00%
Interest expense																						$ 3,300,000	$ 1,000,000
Principal amount of borrowings										$ 200,000,000												$ 200,000,000
Term of accounts receivable securitization program																						1 year
Accounts receivable from securitization										200,000,000												$ 200,000,000
Variable rate basis																						0.007
Securitization Program | Maximum
Debt Instrument [Line Items]
Accounts receivable from securitization										200,000,000												$ 200,000,000				$ 200,000,000
Two Thousand And Twelve Notes [Member]
Debt Instrument [Line Items]
Notes principal amount										17,900,000												17,900,000
Debt extinguishment loss																						(900,000)
Repayments of convertible debt										23,100,000
Conversion price (in dollars per share)											$ 31.175
Two Thousand Ten Original Notes [Member] | Convertible Notes
Debt Instrument [Line Items]
Notes principal amount										$ 46,300,000.0			300,000,000.0									$ 46,300,000.0	300,000,000.0
Debt extinguishment loss													(800,000.0)			$ (15,500,000.0)
Interest rate										2.00%												2.00%
Repayments of convertible debt													79,200,000.0			$ 543,700,000.0
Exceeds percentage of accreted principle amount																						120.00%
Conversion price of notes (in dollars per share)																						$ 23.03
Exceeds percentage of conversion price																						130.00%
Number of trading days 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 ratio																						98.00%
Principal convertible to common stock																						$ 1,000
Principle convertible debt put during period													$ 1,300,000.0
Two Thousand Ten Original Notes [Member] | Convertible Notes | Minimum
Debt Instrument [Line Items]
Number of trading days																						20 days
Two Thousand Ten Original Notes [Member] | Convertible Notes | Maximum
Debt Instrument [Line Items]
Number of trading days																						30 days
Two Thousand Ten Original Notes [Member] | Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Repayments of convertible debt														$ 140,100,000
Conversion price of notes (in dollars per share)														$ 0
Two Thousand And Twelve Notes [Member] | Convertible Notes
Debt Instrument [Line Items]
Conversion price of notes (in dollars per share)																						$ 31.175
Two Thousand And Twelve Notes [Member] | Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Notes principal amount														$ 136,600,000
Debt extinguishment loss																						$ (700,000)
Repayments of convertible debt														$ 171,300,000
Conversion price of notes (in dollars per share)														$ 0
Year Two Thousand Thirteen [Member] | Convertible Notes
Debt Instrument [Line Items]
Conversion price of notes (in dollars per share)																						$ 38.59
Securitization Program
Debt Instrument [Line Items]
Credit agreement interest rate																						1.235%
Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Interest expense																						$ 41,000,000	50,000,000	70,700,000
Non-cash interest expense amortization of debt discount and deferred financing costs																						34,300,000	$ 40,000,000	$ 52,500,000
Debt extinguishment loss														$ (4,500,000)								$ (5,300,000)
Interest rate										2.00%			2.00%									2.00%	2.00%
Convertible Notes Payable [Member] | 2012 and 2013 Notes [Member]
Debt Instrument [Line Items]
Deferred taxes, reacquisition of equity component																						$ 31,100,000
Adjustments to APIC, equity component of convertible debt																						58,600,000
Convertible Notes Payable [Member] | Two Thousand Ten Original Notes [Member]
Debt Instrument [Line Items]
Debt extinguishment loss																						(4,600,000)
Convertible Notes Payable [Member] | 2010 and 2012 Notes [Member]
Debt Instrument [Line Items]
Deferred taxes, reacquisition of equity component																						28,200,000
Adjustments to APIC, equity component of convertible debt																						122,600,000
Term Loan
Debt Instrument [Line Items]
Long-term debt obligations										$ 1,190,500,000			$ 1,308,200,000									1,190,500,000	$ 1,308,200,000
Term Loan | Credit Agreement
Debt Instrument [Line Items]
Amount of credit outstanding										1,500,000,000												$ 1,500,000,000
Debt instrument, maturity date																						May 29, 2020
Term Loan | Credit Agreement | Minimum
Debt Instrument [Line Items]
Scheduled principal payments per quarter																						$ 18,750,000
Term Loan | Credit Agreement | Maximum
Debt Instrument [Line Items]
Scheduled principal payments per quarter																						37,500,000
Revolver | Credit Agreement
Debt Instrument [Line Items]
Amount of credit outstanding										$ 1,000,000,000												$ 1,000,000,000
Debt instrument, maturity date																						May 29, 2020
Amount borrowed under revolver					$ 175,000,000
Term Loan A [Member] | Credit Agreement
Debt Instrument [Line Items]
Amount of credit outstanding					1,000,000,000
Debt instrument, maturity date																					Aug. 01, 2017
Revolving Credit Facility | Credit Agreement
Debt Instrument [Line Items]
Amount of credit outstanding					300,000,000
Debt instrument, maturity date																					Aug. 01, 2017
Term Loan B [Member] | Credit Agreement
Debt Instrument [Line Items]
Amount of credit outstanding					$ 1,500,000,000
Debt instrument, maturity date																					Aug. 01, 2019
Debt extinguishment loss															$ (6,700,000)
Prepaid principal amount						$ 300,000,000
2007 Notes [Member] | Convertible Notes
Debt Instrument [Line Items]
Debt instrument, maturity period									2037
November Eighteen Two Thousand Ten Original Notes [Member] | Convertible Notes
Debt Instrument [Line Items]
Notes principal amount																														$ 450,000,000
Interest rate																														2.00%
Debt instrument, maturity period																		2037
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
Debt Instrument [Line Items]
Notes principal amount								$ 500,000,000
Interest rate								2.00%
Debt instrument, maturity period								2042
Two Thousand Twelve Original Notes [Member] | Convertible Notes
Debt Instrument [Line Items]
Interest rate										2.00%												2.00%
Annual yield to maturity																						2.00%
Exceeds percentage of accreted principle amount																						120.00%
Exceeds percentage of conversion price																						130.00%
Number of trading days 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 ratio																						98.00%
Principal convertible to common stock																						$ 1,000,000
Two Thousand Twelve Original Notes [Member] | Convertible Notes | Minimum
Debt Instrument [Line Items]
Number of trading days																						20 days
Two Thousand Twelve Original Notes [Member] | Convertible Notes | Maximum
Debt Instrument [Line Items]
Number of trading days																						30 days
Due December Two Zero One Seven [Member] | Convertible Notes | Two Thousand Thirteen Original Notes [Member]
Debt Instrument [Line Items]
Annual yield to maturity																						4.00%
Thereafter [Member] | Convertible Notes | Two Thousand Thirteen Original Notes [Member]
Debt Instrument [Line Items]
Annual yield to maturity																						2.00%
Two Thousand Thirteen Original Notes [Member] | Convertible Notes
Debt Instrument [Line Items]
Exceeds percentage of conversion price																						130.00%
Number of trading days 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 ratio																						98.00%
Convertible notes, triggering events										$ 0												$ 0
Two Thousand Thirteen Original Notes [Member] | Convertible Notes | Minimum
Debt Instrument [Line Items]
Number of trading days																						20 days
Two Thousand Thirteen Original Notes [Member] | Convertible Notes | Maximum
Debt Instrument [Line Items]
Number of trading days																						30 days
February Fourteen Two Thousand And Thirteen Original Notes [Member] | Convertible Notes
Debt Instrument [Line Items]
Notes principal amount							$ 370,000,000
Interest rate							2.00%
Debt instrument, maturity period							2043
Convertible Debt [Member] | 2010 Notes [Member]
Debt Instrument [Line Items]
Redemption price, percentage			100.00%	100.00%
Senior Notes
Debt Instrument [Line Items]
Aggregate redemption price																											1,030,000,000
Premium payment																											$ 31,250,000
Subsequent Event | Term Loan | Credit Agreement
Debt Instrument [Line Items]
Amount of credit outstanding																									$ 1,500,000,000
Subsequent Event | Senior Notes | 2025 Notes
Debt Instrument [Line Items]
Notes principal amount		$ 350,000,000
Interest rate		4.375%
Offering price, percentage of principal amount		100.00%
Maximum percentage of redemption of senior notes		35.00%
Percentage of redemption price, second period		104.375%
Percentage of redemption price, third period		102.188%
Percentage of redemption price, fourth period		101.094%
Percentage of redemption price, fifth period		100.00%
Percentage price of principal amount for repurchase of senior note		101.00%
On or After December 15, 2017 [Member] | Convertible Notes
Debt Instrument [Line Items]
Debt instrument, maturity date range, start				Dec. 15, 2017
Redemption price as percentage of principle amount plus accrued and unpaid interest																						100.00%
December 15, 2017 [Member] | Subsequent Event | Convertible Debt [Member] | 2013 Notes
Debt Instrument [Line Items]
Redemption price, percentage	100.00%

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Convertible Notes, Triggering Events 1) During any calendar quarter if the last reported sales price of the Company's common stock exceeds 130% of the conversion price for at least 20 trading days in the 30 consecutive trading days ending on the last trading day of the preceding calendar quarter 2) During the 5 business day period after any five consecutive trading day period in which the trading price per note for each day of such period was less than 98% of the product of the last reported sales price of the Company's common stock and the conversion rate on each such day 3) If the notes have been called for redemption 4) Upon the occurrence of specified corporate events

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Debt Instrument Percentage Of Redemption Price if Senior Notes are redeemed by the Company beginning August 1, 2018 and thereafter.

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Debt Instrument Percentage Of Redemption Price if Senior Notes are redeemed by the Company after August 1, 2017 through July 31, 2018.

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Debt Instrument Percentage Of Redemption Price if Senior Notes are redeemed by the Company after August 1, 2016 through July 31, 2017.

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The lowest the total net leverage ratio will be under the senior secured credit facilities beginning the quarter ending September 30, 2017.

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Represents the percentage of the accreted principal amount of the Convertible Notes to be paid as an extension fee penalty in the event of default, as defined, related to the Company's failure to comply with the reporting obligations in the Convertible Notes.

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Fees recorded as debt discount

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Long term debt obligations without convertible notes.

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