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Borrowings and Credit Arrangements - Additional Information (Detail)			3 Months Ended			6 Months Ended
	Jan. 19, 2018 USD ($)	Oct. 10, 2017 USD ($)	Mar. 31, 2018 USD ($)	Dec. 30, 2017 USD ($) $ / shares	Apr. 01, 2017 USD ($)	Mar. 31, 2018 USD ($)	Apr. 01, 2017 USD ($)	Apr. 20, 2018 USD ($)	Feb. 15, 2018 USD ($)	Oct. 03, 2017 USD ($)	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Current portion of long-term debt			$ 611,500,000			$ 611,500,000					$ 1,150,800,000
Non-cash interest expense amortization of debt discount and deferred financing costs						11,200,000	$ 26,900,000
Debt extinguishment losses			44,900,000		$ 0	45,900,000	0
Payment of debt issuance costs						(23,500,000)	0
Debt issuance costs									$ 1,500,000
Senior notes	$ 1,000,000,000
Borrowed principal			1,000,000,000			1,000,000,000
Debt discount									1,500,000
Cash paid for conversion of debt						302,800,000	$ 21,000,000
Adjustments to additional paid in capital, equity component of convertible debt				$ 13,400,000
Deferred taxes, reacquisition of equity component				3,800,000
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 | Percentage Added to Eurodollar Rate
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
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)
2043 Notes
Debt Instrument [Line Items]
Senior notes				300,000
Cash paid for conversion of debt				244,100,000
Repurchase amount				201,700,000
2042 Notes
Debt Instrument [Line Items]
Senior notes				39,300,000
Cash paid for conversion of debt			$ 243,300,000	$ 52,800,000
Repurchase amount			200,500,000			200,500,000
Debt instrument remaining to be redeemed			5,500,000			$ 5,500,000
2012 Notes
Debt Instrument [Line Items]
Convertible debt conversion price | $ / shares				$ 31.175
Credit Agreement
Debt Instrument [Line Items]
Repayments of secured debt			$ 1,320,000,000
Weighted average interest rates			3.07757%		2.28%	2.96%	2.17%
Interest rate			3.37688%
Interest expense			$ 13,800,000		$ 9,800,000	$ 26,200,000	$ 19,500,000
Non-cash interest expense amortization of debt discount and deferred financing costs			500,000		1,000,000	1,200,000	2,100,000
Borrowed principal			$ 1,600,000,000			$ 1,600,000,000
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			$ 7,100,000			$ 21,100,000
Non-cash interest expense amortization of debt discount and deferred financing costs			500,000			1,500,000
Debt extinguishment losses			0
Direct third party costs interest expense			0
Senior notes									1,000,000,000
Offering price of principal amount									1,040,000,000
Make whole provision									$ 0
Securitization Program
Debt Instrument [Line Items]
Borrowed principal			200,000,000			200,000,000
Securitization Program | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing under securitization program								$ 225,000,000
Additional borrowing under securitization program								$ 25,000,000
2028 Senior Notes
Debt Instrument [Line Items]
Interest expense			3,700,000
Non-cash interest expense amortization of debt discount and deferred financing costs			0
Senior notes			400,000,000			400,000,000
Borrowed principal	400,000,000
Secured Term Loan | Amended Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 1,500,000,000
2025 Senior Notes
Debt Instrument [Line Items]
Interest expense			9,400,000			12,900,000
Non-cash interest expense amortization of debt discount and deferred financing costs			500,000			600,000
Senior notes			950,000,000			950,000,000
Borrowed principal	$ 600,000,000
Revolver
Debt Instrument [Line Items]
Current portion of long-term debt			$ 155,000,000			$ 155,000,000					345,000,000
2022 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%
Percentage price of principal amount for repurchase of senior notes	101.00%
Debt instrument percentage redemption price sixth period	100.00%
2022 Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Stated interest rate			4.375%			4.375%
Senior notes		350,000,000
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%
Convertible Debt | 2042 Notes
Debt Instrument [Line Items]
Stated interest rate			2.00%			2.00%
Redemption price, percentage of principal redeemed	100.00%
Convertible Debt | 2012 Notes
Debt Instrument [Line Items]
Stated interest rate				2.00%
Convertible Notes Payable
Debt Instrument [Line Items]
Interest expense			$ 1,400,000		11,200,000	$ 7,100,000	23,300,000
Non-cash interest expense amortization of debt discount and deferred financing costs			700,000		$ 9,400,000	5,300,000	$ 19,500,000
Securitization Program
Debt Instrument [Line Items]
Current portion of long-term debt			200,000,000			$ 200,000,000					$ 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

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