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Borrowings and Credit Arrangements - Additional Information (Detail)				3 Months Ended				9 Months Ended
	Jul. 10, 2018 USD ($)	Jan. 19, 2018 USD ($)	Oct. 10, 2017 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 30, 2017 USD ($) $ / shares	Jul. 01, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jul. 01, 2017 USD ($)	Apr. 20, 2018 USD ($)	Feb. 15, 2018 USD ($)	Oct. 03, 2017 USD ($)	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Proceeds from amounts borrowed under revolving credit line								$ 960,000,000	$ 125,000,000
Cash paid for conversion of debt								546,200,000	290,100,000
Current portion of long-term debt				$ 525,200,000				525,200,000					$ 1,150,800,000
Non-cash interest expense amortization of debt discount and deferred financing costs								13,100,000	38,900,000
Debt extinguishment losses				0			$ 2,600,000	45,900,000	2,600,000
Payment of debt issuance costs								23,500,000	$ 0
Senior notes		$ 1,000,000,000	$ 350,000,000
Borrowed principal				1,000,000,000				1,000,000,000
Debt issuance costs											$ 1,500,000
Debt discount											1,500,000
Adjustments to additional paid in capital, equity component of convertible debt						$ 13,400,000
Deferred taxes, reacquisition of equity component					$ 12,000,000	3,800,000
Maximum borrowing under securitization program				$ 225,000,000				225,000,000
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%
Amended Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity												$ 1,500,000,000
Amended Revolver | Subsequent Event
Debt Instrument [Line Items]
Proceeds from amounts borrowed under revolving credit line	$ 90,000,000
Amended Revolver | Percentage Added to Eurodollar Rate
Debt Instrument [Line Items]
Basis spread on variable rate				1.50%
Convertible Notes Payable
Debt Instrument [Line Items]
Cash paid for conversion of debt				$ 165,000,000
Revolver
Debt Instrument [Line Items]
Proceeds from amounts borrowed under revolving credit line				$ 250,000,000
Amended Credit Agreement
Debt Instrument [Line Items]
Leverage ratio maximum				5.00
Decreased net leverage ratio pursuant to senior secured credit facility				4.50
Interest coverage ratio				3.75
Number of fiscal quarters ending on measurement date				4
Debt extinguishment losses						1,000,000
Maximum range of present value of cash flow percentage					10.00%
Direct third party costs interest expense						1,700,000
Payment of debt issuance costs						4,900,000
Credit Agreement
Debt Instrument [Line Items]
Repayments of secured debt								$ 1,320,000,000
Weighted average interest rates				3.41%			2.50%	3.11%	2.28%
Interest rate				3.59%
Interest expense				$ 17,100,000			$ 10,500,000	$ 43,300,000	$ 30,100,000
Non-cash interest expense amortization of debt discount and deferred financing costs				700,000			1,000,000	1,800,000	3,200,000
Borrowed principal				$ 1,700,000,000				$ 1,700,000,000
2025 Senior Notes
Debt Instrument [Line Items]
Stated interest rate				4.375%				4.375%
2022 Senior Notes
Debt Instrument [Line Items]
Stated interest rate				5.25%				5.25%
Interest expense				$ 0				$ 21,100,000
Non-cash interest expense amortization of debt discount and deferred financing costs				0				1,500,000
Debt extinguishment losses					$ 44,900,000
Direct third party costs interest expense					2,600,000
Senior notes											1,000,000,000
Offering price of principal amount											1,040,000,000
Make whole provision											$ 37,700,000
2042 Notes
Debt Instrument [Line Items]
Cash paid for conversion of debt				243,300,000		52,800,000
Senior notes, face amount						$ 39,300,000
Convertible debt conversion price | $ / shares						$ 31.175
Adjustments to additional paid in capital, equity component of convertible debt					42,800,000
Repurchase amount					$ 200,500,000
Debt instrument remaining to be redeemed						$ 5,500,000
2043 Notes
Debt Instrument [Line Items]
Cash paid for conversion of debt						244,100,000
Senior notes, face amount						300,000
Repurchase amount						$ 201,700,000
Securitization Program
Debt Instrument [Line Items]
Borrowed principal				219,800,000				219,800,000
Maximum borrowing under securitization program										$ 200,000,000
Amended Term Loan | Amended Credit Agreement | Minimum
Debt Instrument [Line Items]
Periodic principal payment				$ 9,375,000
Periodic principal payment period				3 months
Amended Term Loan | Amended Credit Agreement | Maximum
Debt Instrument [Line Items]
Periodic principal payment				$ 37,500,000
Secured Term Loan | Amended Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity												$ 1,500,000,000
Revolver
Debt Instrument [Line Items]
Current portion of long-term debt				240,000,000				240,000,000					345,000,000
Convertible Notes Payable
Debt Instrument [Line Items]
Interest expense				0			10,100,000	7,100,000	33,400,000
Non-cash interest expense amortization of debt discount and deferred financing costs				0			$ 8,500,000	5,300,000	$ 28,000,000
2025 Senior Notes
Debt Instrument [Line Items]
Interest expense				10,900,000				23,800,000
Non-cash interest expense amortization of debt discount and deferred financing costs				500,000				1,100,000
Borrowed principal		600,000,000
Senior notes, face amount				950,000,000				950,000,000
2028 Senior Notes
Debt Instrument [Line Items]
Interest expense				4,800,000				8,500,000
Non-cash interest expense amortization of debt discount and deferred financing costs				200,000				300,000
Borrowed principal		400,000,000
Senior notes, face amount				$ 400,000,000				$ 400,000,000
Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Stated interest rate				4.375%				4.375%
Offering price of principal amount		$ 1	$ 1
Redemption price (as a percent)				35.00%
Debt instrument percentage of redemption price second period			104.375%
Debt instrument percentage of redemption price third period			102.188%
Debt instrument percentage of redemption price fourth period			101.094%
Debt instrument percentage of redemption price fifth period			100.00%
Percentage price of principal amount for repurchase of senior notes			101.00%
Senior Notes | 2028 Senior Notes
Debt Instrument [Line Items]
Stated interest rate		4.625%		4.625%				4.625%
Offering price of principal amount		$ 1	$ 1
Redemption price (as a percent)				35.00%
Debt instrument percentage of redemption price second period		104.625%
Debt instrument percentage of redemption price third period		102.312%
Debt instrument percentage of redemption price fourth period		101.541%
Debt instrument percentage of redemption price fifth period		100.77%
Debt instrument percentage redemption price sixth period		100.00%
Percentage price of principal amount for repurchase of senior notes		101.00%
Convertible Debt | 2042 Notes
Debt Instrument [Line Items]
Stated interest rate				2.00%		2.00%		2.00%
Redemption price, percentage of principal redeemed		100.00%
Convertible Debt | 2043 Notes
Debt Instrument [Line Items]
Stated interest rate						2.00%
Securitization Program
Debt Instrument [Line Items]
Current portion of long-term debt				$ 219,800,000				$ 219,800,000					$ 200,000,000
Senior notes, face amount				$ 219,800,000				$ 219,800,000

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