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Debt - Summary of Conversion Features (Details) shares in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 27, 2020 USD ($) | Mar. 31, 2020 USD ($) shares | Nov. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) shares | Feb. 28, 2017 USD ($) shares | Feb. 28, 2015 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2020 USD ($) day | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($) | Mar. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
If-converted value in excess of principal |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Shares issued to settle convertible debt |  |  |  |  |  |  |  |  |  |  | 351,800,000 |  | $ 298,500,000 |  |
Loss on settlement of debt |  |  |  |  |  |  | $ 3,400,000 | $ 1,900,000 | $ 8,300,000 | $ 4,100,000 | 5,400,000 | $ 12,600,000 | 16,000,000.0 | $ 43,900,000 | $ 50,600,000
Gross long-term debt including current maturities |  | $ 10,593,300,000 |  |  |  |  | 10,593,300,000 |  | 11,659,300,000 |  | 10,593,300,000 | 11,659,300,000 |  |  |
Debt instrument, unamortized discount |  | 1,043,200,000 |  |  |  |  | 1,043,200,000 |  | 1,268,700,000 |  | 1,043,200,000 | 1,268,700,000 |  |  |
Debt issuance costs, net |  | 67,900,000 |  |  | $ 33,700,000 |  | 67,900,000 |  | 83,600,000 |  | $ 67,900,000 | 83,600,000 |  |  |
Debt portion of convertible debt issuance costs |  |  |  |  | 3,400,000 |  |  |  |  |  |  |  |  |  |
Equity portion of convertible debt issuance costs |  |  |  |  | 12,500,000 |  |  |  |  |  |  |  |  |  |
Induced conversion of convertible debt expense |  |  |  |  | 5,000,000.0 |  |  |  |  |  |  |  |  |  |
2017 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) |  |  |  |  |  |  |  |  |  |  | 6 years 10 months 24 days |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  |  | 2,040,000,000.00 |  |  |  |  |  |  |  |  |  |
Debt portion of convertible debt issuance costs |  |  |  |  | 17,800,000 |  |  |  |  |  |  |  |  |  |
2015 Senior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) |  |  |  |  |  |  |  |  |  |  | 4 years 10 months 24 days |  |  |  |
Extinguishment of debt, principal amount |  | 615,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on settlement of debt |  | 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  |  |  | $ 1,690,000,000 |  |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  |  |  |  | 30,300,000 |  |  |  |  |  |  |  |  |
Debt portion of convertible debt issuance costs |  |  |  |  |  | 20,400,000 |  |  |  |  |  |  |  |  |
Equity portion of convertible debt issuance costs |  |  |  |  |  | 9,900,000 |  |  |  |  |  |  |  |  |
2015 Senior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  | $ 615,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to settle convertible debt (in shares) | shares |  | 5.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to settle convertible debt |  | $ 351,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration, extinguishment of debt |  | 966,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration, extinguishment of debt, liability component |  | 460,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration, extinguishment of debt, equity component |  | 461,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Junior Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) |  |  |  |  |  |  |  |  |  |  | 16 years 10 months 24 days |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  |  | 567,700,000 |  |  |  |  |  |  |  |  |  |
2017 Junior Convertible Debt | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to settle convertible debt |  |  |  | $ 119,300,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  | 111,300,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, unamortized discount |  |  |  | 55,100,000 |  |  |  |  |  |  |  |  |  |  |
2007 Junior Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,500,000 |  |
Shares issued to settle convertible debt (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 0.5 |  |
Loss on settlement of debt |  |  |  | 13,800,000 |  |  |  |  |  |  |  |  | $ 2,200,000 |  |
2007 Junior Convertible Notes | Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  | $ 14,600,000 | $ 111,300,000 | $ 431,300,000 | 575,000,000.0 |  |  |  |  |  |  |  |  |
Shares issued to settle convertible debt (in shares) | shares |  |  |  | 3.2 | 12.0 |  |  |  |  |  |  |  |  |  |
Shares issued to settle convertible debt |  |  |  | $ 254,600,000 | $ 862,700,000 |  |  |  |  |  |  |  |  |  |
Total consideration, extinguishment of debt |  |  |  | 374,000,000.0 | 1,290,000,000 | 1,130,000,000 |  |  |  |  |  |  |  |  |
Total consideration, extinguishment of debt, liability component |  |  |  | 56,300,000 | 188,000,000.0 | 238,300,000 |  |  |  |  |  |  |  |  |
Total consideration, extinguishment of debt, equity component |  |  |  | $ 321,100,000 | $ 1,110,000,000 | $ 896,300,000 |  |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,000,000.0 |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Gross long-term debt including current maturities |  | 3,866,300,000 |  |  |  |  | 3,866,300,000 |  | 4,481,300,000 |  | $ 3,866,300,000 | 4,481,300,000 |  |  |
Convertible Debt | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |
Threshold trading days | day |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Threshold consecutive trading days | day |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
Convertible Debt | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  |  |  |  |  | 98.00% |  |  |  |
Threshold trading days | day |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Threshold consecutive trading days | day |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, net |  | $ 3,900,000 |  |  |  |  | 3,900,000 |  |  |  | $ 3,900,000 |  |  |  |
Bridge Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured bridge agreement term | 364 days | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |
Gross long-term debt including current maturities |  | $ 615,000,000.0 |  |  |  |  | 615,000,000.0 |  | 0 |  | 615,000,000.0 | 0 |  |  |
Debt instrument, unamortized discount |  | 3,100,000 |  |  |  |  | 3,100,000 |  | 0 |  | 3,100,000 | 0 |  |  |
Debt issuance costs, net | $ 6,200,000 | $ 3,100,000 |  |  |  |  | $ 3,100,000 |  | $ 0 |  | $ 3,100,000 | $ 0 |  |  |

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- Definition Total Consideration, Extinguishment of Debt, Equity Component + References No definition available. + Details
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- Definition Total Consideration, Extinguishment of Debt, Liability Component + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature. + References No definition available. + Details
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- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. + References No definition available. + Details
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- Definition Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Consideration given by issuer of convertible debt to provide an incentive for debt holders to convert the debt to equity securities. The expense is equal to the fair value of all securities and other consideration transferred in the transaction in excess of the fair value of securities issuable pursuant to the original conversion terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 40 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=99385385&loc=d3e6835-112609 + Details
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- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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