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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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