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Borrowings and Credit Arrangements - Additional Information (Detail)								1 Months Ended	3 Months Ended									6 Months Ended	12 Months Ended
	Oct. 01, 2018 USD ($)	Jan. 19, 2018 USD ($)	Dec. 19, 2016	Nov. 09, 2016	Feb. 14, 2013 USD ($)	Feb. 29, 2012 USD ($)	Dec. 10, 2007 USD ($)	Dec. 10, 2007 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 30, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Jul. 01, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($)	Sep. 24, 2016 USD ($)	Mar. 26, 2016 USD ($) $ / shares	Dec. 25, 2010	Apr. 01, 2017 USD ($)	Sep. 29, 2018 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Sep. 24, 2016 USD ($)	Apr. 20, 2018 USD ($)	Feb. 15, 2018 USD ($)	Oct. 10, 2017 USD ($)	Oct. 03, 2017 USD ($)	Apr. 21, 2017 USD ($)	May 29, 2015 USD ($)	Nov. 18, 2010 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of senior long-term debt		$ 1,000,000,000
Proceeds from amounts borrowed under revolving credit line																			$ 1,150,000,000	$ 345,000,000	$ 50,000,000
Notes principal amount													$ 100,000,000.0
Senior Notes		$ 600,000,000																						$ 350,000,000
Non-cash interest expense amortization of debt discount and deferred financing costs																			15,000,000	49,400,000	52,100,000
Debt extinguishment loss										$ 44,900,000			2,600,000						45,900,000	3,200,000	5,300,000
Payment of debt issuance costs																			23,500,000	0	0
Principal amount of borrowings																			1,000,000,000
Repayments of convertible debt													269,100,000	$ 12,300,000					546,200,000	396,200,000	392,800,000
Current portion of long-term debt												$ 1,150,800,000							599,700,000	1,150,800,000
Conversion premium																		$ 8,700,000
Deferred taxes, reacquisition of equity component											$ 3,800,000
Adjustments to APIC, equity component of convertible debt											13,400,000								(40,700,000)	(33,900,000)	(94,400,000)
Maximum borrowing under securitization program									$ 225,000,000
Accretion expense													$ 18,500,000
Debt issuance costs, net																			1,500,000
Debt discount																			$ 1,500,000
Amended Credit Agreement
Debt Instrument [Line Items]
Leverage ratio maximum																			5.00
Interest coverage ratio																			3.75
Decreased net leverage ratio																			4.50
Debt extinguishment loss											1,000,000
Maximum range of present value of cash flow, percentage										10.00%									10.00%
Third-party costs											1,700,000
Payment of debt issuance costs											4,900,000
Amended Term Loan
Debt Instrument [Line Items]
Proceeds from issuance of debt																			$ 1,800,000,000
Amended Term Loan | Percentage Added to Eurodollar Rate
Debt Instrument [Line Items]
Basis spread on variable rate																			1.50%
2013 Notes
Debt Instrument [Line Items]
Notes principal amount																			$ 68,000,000
Debt extinguishment loss																			(2,300,000)
Repayments of convertible debt												82,900,000
Conversion price (in dollars per share) | $ / shares													$ 38.59
Accretion expense												13,300,000
Credit Agreement
Debt Instrument [Line Items]
Repayments of secured debt																			1,320,000,000
Proceeds under credit agreement																											$ 1,680,000,000
Principal amount of borrowings																			$ 1,760,000,000
2025 Senior Notes
Debt Instrument [Line Items]
Interest rate																			4.375%
2022 Notes
Debt Instrument [Line Items]
Senior Notes																							$ 1,000,000,000
Debt extinguishment loss										$ 44,900,000
Third-party costs										2,600,000
Interest rate																			5.25%
Offering price, percentage of principal amount																							1,040,000,000
Make whole provision																							$ 37,700,000
Convertible Notes | 2007 Notes
Debt Instrument [Line Items]
Notes principal amount					$ 370,000,000.0	$ 500,000,000.0	$ 1,725,000,000.000	$ 1,725,000,000.000																				$ 450,000,000.0
Interest rate							2.00%	2.00%
Proceeds from issuance of convertible debt							$ 1,725,000,000
Convertible Notes Payable
Debt Instrument [Line Items]
Repayments of convertible debt									165,000,000
Securitization Program
Debt Instrument [Line Items]
Basis spread on variable rate																			0.70%
Weighted average interest rate																			2.42%
Interest expense																			$ 5,400,000	3,300,000	1,100,000
Principal amount of borrowings																			$ 225,000,000
Term of accounts receivable securitization program																			1 year
Accounts receivable from securitization																			$ 200,000,000
Maximum borrowing under securitization program																						$ 200,000,000
Securitization Program | Maximum
Debt Instrument [Line Items]
Accounts receivable from securitization																			200,000,000							$ 200,000,000
2012 Notes
Debt Instrument [Line Items]
Notes principal amount																			17,900,000
Debt extinguishment loss																			$ (900,000)
Repayments of convertible debt												23,100,000
Conversion price (in dollars per share) | $ / shares													$ 31.175
Revolver
Debt Instrument [Line Items]
Proceeds from amounts borrowed under revolving credit line									250,000,000
Amended Revolver
Debt Instrument [Line Items]
Amount of credit outstanding																									$ 1,500,000,000.0
Amended Revolver | Percentage Added to Eurodollar Rate
Debt Instrument [Line Items]
Basis spread on variable rate																			1.50%
2012 Notes
Debt Instrument [Line Items]
Notes principal amount											39,300,000
Repayments of convertible debt									$ 243,300,000		52,800,000
Repurchase amount										200,500,000
Deferred taxes, reacquisition of equity component										12,000,000
Debt instrument remaining to be redeemed											$ 5,500,000
Adjustments to APIC, equity component of convertible debt										$ 42,800,000
Conversion price (in dollars per share) | $ / shares											$ 31.175
2013 Notes
Debt Instrument [Line Items]
Notes principal amount											$ 300,000
Repayments of convertible debt											244,100,000
Repurchase amount											$ 201,700,000
2012 and 2013 Notes
Debt Instrument [Line Items]
Debt extinguishment loss												(600,000)
2010 Original Notes | Convertible Notes
Debt Instrument [Line Items]
Notes principal amount																			$ 46,300,000.0
Debt extinguishment loss															$ 800,000
Repayments of convertible debt															79,200,000
Conversion price of notes (in dollars per share) | $ / shares																			$ 23.03
Principle convertible debt put during period															$ 1,300,000
2010 Original Notes | Convertible Notes Payable
Debt Instrument [Line Items]
Repayments of convertible debt																$ 140,100,000
Conversion price of notes (in dollars per share) | $ / shares																$ 23.03
2012 Notes | Convertible Notes Payable
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) | $ / shares																$ 31.175
2028 Senior Notes
Debt Instrument [Line Items]
Notes principal amount																			400,000,000
Principal amount of borrowings																			$ 950,000,000
Offering price, percent of face value																			100.00%
Long-term debt obligations												0							$ 393,100,000	0
Amended Term Loan | Amended Credit Agreement | Minimum
Debt Instrument [Line Items]
Periodic payment, principal																			$ 9,375,000
Periodic payment, principal, period																			3 months
Amended Term Loan | Amended Credit Agreement | Maximum
Debt Instrument [Line Items]
Periodic payment, principal																			$ 37,500,000
Secured Term Loan | Amended Term Loan
Debt Instrument [Line Items]
Amount of credit outstanding																									$ 1,500,000,000.0
Securitization Program
Debt Instrument [Line Items]
Notes principal amount																			$ 225,000,000.0
Weighted average interest rate																			2.24%
Current portion of long-term debt												200,000,000							$ 225,000,000	200,000,000
Convertible Notes Payable
Debt Instrument [Line Items]
Interest expense																			7,100,000	41,000,000	50,000,000
Non-cash interest expense amortization of debt discount and deferred financing costs																			5,300,000	34,300,000	40,000,000
Debt extinguishment loss																$ (4,500,000)			(5,300,000)
Convertible Notes Payable | 2012 and 2013 Notes
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 | 2010 Original Notes
Debt Instrument [Line Items]
Debt extinguishment loss																			(4,600,000)
Convertible Notes Payable | 2010 and 2012 Notes
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							1,376,300,000	1,190,500,000
Current portion of long-term debt												121,300,000							74,700,000	121,300,000
Term Loan | Credit Agreement
Debt Instrument [Line Items]
Amount of credit outstanding																			$ 1,500,000,000.0
Debt instrument, maturity date																			May 29, 2020
Revolver
Debt Instrument [Line Items]
Current portion of long-term debt												$ 345,000,000							$ 300,000,000	345,000,000
Revolver | Credit Agreement
Debt Instrument [Line Items]
Amount of credit outstanding																			$ 1,000,000,000
Debt instrument, maturity date																			May 29, 2020
2007 Notes | Convertible Notes
Debt Instrument [Line Items]
Debt instrument, maturity period								2037
November 18, 2010 Original Notes | Convertible Notes
Debt Instrument [Line Items]
Notes principal amount																												$ 450,000,000.0
Interest rate																												2.00%
Debt instrument, maturity period																	2037
November 18, 2010 Original Notes | Convertible Notes Payable
Debt Instrument [Line Items]
Notes principal amount																$ 90,000,000.0
February 29, 2012 Original Notes | Convertible Notes
Debt Instrument [Line Items]
Notes principal amount						$ 500,000,000.0
Interest rate						2.00%
Debt instrument, maturity period						2042
February 14, 2013 Original Notes | Convertible Notes
Debt Instrument [Line Items]
Notes principal amount					$ 370,000,000.0
Interest rate					2.00%
Debt instrument, maturity period					2043
Convertible Debt | 2042 Notes
Debt Instrument [Line Items]
Interest rate									2.00%
Convertible Debt | 2010 Notes
Debt Instrument [Line Items]
Redemption price, percentage			100.00%	100.00%
Senior Notes
Debt Instrument [Line Items]
Non-cash interest expense amortization of debt discount and deferred financing costs																			$ 3,600,000	3,900,000	3,800,000
Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Non-cash interest expense amortization of debt discount and deferred financing costs																			$ 1,600,000	0	0
Interest rate																			4.375%
Offering price, percent of face value		100.00%																	100.00%					100.00%
Redemption price, percentage																			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 redemption price, sixth period																			100.00%
Percentage price of principal amount for repurchase of senior notes																			101.00%
Senior Notes | 2028 Senior Notes
Debt Instrument [Line Items]
Non-cash interest expense amortization of debt discount and deferred financing costs																			$ 500,000	$ 0	$ 0
Interest rate																			4.625%
Offering price, percent of face value																			100.00%
Redemption price, percentage																			35.00%
Percentage of redemption price, second period																			104.625%
Percentage of redemption price, third period																			102.312%
Percentage of redemption price, fourth period																			101.541%
Percentage of redemption price, fifth period																			100.77%
Percentage redemption price, sixth period																			100.00%
Percentage price of principal amount for repurchase of senior notes																			101.00%
Subsequent Event | Convertible Notes Payable
Debt Instrument [Line Items]
Repayments of convertible debt	$ 50,000,000
March 1, 2018 | 2012 Notes
Debt Instrument [Line Items]
Redemption price as percentage of principle amount plus accrued and unpaid interest																			100.00%
March 6, 2018 | 2012 Notes
Debt Instrument [Line Items]
Redemption price as percentage of principle amount plus accrued and unpaid interest																			100.00%

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