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Borrowings and Credit Arrangements - Additional Information (Detail) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Jun. 25, 2022 | Dec. 17, 2018 USD ($) | Jan. 19, 2018 USD ($) | Dec. 19, 2016 | Nov. 09, 2016 | Dec. 29, 2018 USD ($) debt_instrument | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 30, 2017 USD ($) $ / shares | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) | Apr. 01, 2017 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 29, 2019 USD ($) | Mar. 30, 2019 USD ($) | Feb. 15, 2018 USD ($) | Oct. 10, 2017 USD ($) | Oct. 03, 2017 USD ($) | Sep. 24, 2016 | Feb. 14, 2013 USD ($) | Feb. 29, 2012 USD ($) | Nov. 18, 2010 USD ($) | Dec. 10, 2007 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from amounts borrowed under revolving credit line |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 480,000,000.0 | $ 1,150,000,000.0 | $ 345,000,000.0 |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  | $ 44,900,000 |  |  | 2,600,000 |  |  | 800,000 | 45,900,000 | 3,200,000 |  |  |  |  |  |  |  |  |  |
Payment of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 | 23,500,000 | 0 |  |  |  |  |  |  |  |  |  |
Principal amount of borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  |  |  | 269,100,000 | $ 12,300,000 |  | 0 | 546,200,000 | 396,200,000 |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 271,400,000 | 599,700,000 |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |
Accretion expense |  |  |  |  |  |  |  |  |  |  | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Amended Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio maximum |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00 |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.75 |  |  |  |  |  |  |  |  |  |  |  |
2018 Amended Credit Facility | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio maximum | 4.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  | $ (800,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum range of present value of cash flow (percent) |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party costs recorded as interest |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of debt issuance costs |  |  |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.23% |  |  |  |  |  |  |  |  |  |  |
Interest rate at end of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.74% |  |  |  |  |  |  |  |  |  |  |
2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from amounts borrowed under revolving credit line |  |  |  |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum range of present value of cash flow (percent) |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party costs recorded as interest |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of debt issuance costs |  |  |  |  |  |  |  |  | 4,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,320,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.39% |  |  |  |  |  |  |  |  |  |
Interest rate at end of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.73% |  |  |  |
2022 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  | $ 44,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum range of present value of cash flow (percent) |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-party costs recorded as interest |  |  |  |  |  |  |  | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs reallocated upon debt modification |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discount reallocated upon debt modification |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes | 2007 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 370,000,000.0 | $ 500,000,000.0 | $ 450,000,000.0 | $ 1,725,000,000
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
2012 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face 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 |  |  |  |  |  |  |  | 12,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 Notes | March 1, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principle amount plus accrued and unpaid interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
2012 Notes | March 6, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as percentage of principle amount plus accrued and unpaid interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
2013 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  |  |  | 244,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase amount |  |  |  |  |  |  |  |  | $ 201,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securitization Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0 |  |  |  | $ 225,000,000.0 |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70% |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.08% |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,100,000 | $ 5,400,000 | $ 3,300,000 |  |  |  |  |  |  |  |  |  |
Principal amount of borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 234,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Term of accounts receivable securitization program |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under securitization program |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate at end of period |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.76% |  |  |  |  |  |  |  |  |  |  |  |
2012 and 2013 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  | $ (600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2018 Amended Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2018 Amended Term Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter |  | 9,375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Estimated Due At Maturity After Scheduled Principal Payments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2018 Amended Term Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter |  | $ 28,125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2018 Amended Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |
Line of Credit | 2018 Amended Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit borrowing capacity |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from amounts borrowed under revolving credit line |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | 2018 Amended Revolver | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |
Senior Notes | 2025 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.375% |  |  |  |  |  |  |  |  |  |  |  |
Senior notes principal amount |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |
Principal amount of borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 950,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.625% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior long-term debt |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 2022 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  |  |  |  |  |  |
Senior notes principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |
Offering price of principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,040,000,000.00 |  |  |  |  |  |  |
Make whole provision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,700,000 |  |  |  |  |  |  |
November 18, 2010 Original Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000.0 |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |
February 29, 2012 Original Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
February 14, 2013 Original Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 370,000,000.0 |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |
Convertible Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,100,000 | $ 41,000,000.0 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Securitization Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 234,000,000.0 | $ 225,000,000.0 |  | $ 234,000,000.0 |  |  |  |  |  |  |  |  |
Convertible Debt | 2042 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | 2010 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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