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Fair Value Measurements (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Total assets measured at fair value | $ 430,900,000 | $ 2,196,600,000 |
Money market mutual funds |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents | 8,300,000 | 121,000,000.0 |
Deposit accounts |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents | 420,300,000 | 641,600,000 |
Commercial paper |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents |  | 118,700,000 |
Government agency bonds |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents |  | 20,000,000.0 |
Fair Value, Inputs, Level 1 |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Total assets measured at fair value | 10,600,000 | 123,800,000 |
Fair Value, Inputs, Level 1 | Money market mutual funds |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents | 8,300,000 | 121,000,000.0 |
Fair Value, Inputs, Level 1 | Deposit accounts |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents | 0 | 0 |
Fair Value, Inputs, Level 1 | Commercial paper |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents |  | 0 |
Fair Value, Inputs, Level 1 | Government agency bonds |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents |  | 0 |
Fair Value, Inputs, Level 2 |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Total assets measured at fair value | 420,300,000 | 2,072,800,000 |
Fair Value, Inputs, Level 2 | Money market mutual funds |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents | 0 | 0 |
Fair Value, Inputs, Level 2 | Deposit accounts |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents | 420,300,000 | 641,600,000 |
Fair Value, Inputs, Level 2 | Commercial paper |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents |  | 118,700,000 |
Fair Value, Inputs, Level 2 | Government agency bonds |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Cash and cash equivalents |  | 20,000,000.0 |
Fair Value, Inputs, Level 3 |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Impairment charges | 0 | 0 | $ 0
Short-term Investments | Government agency bonds |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 723,200,000 |
Short-term Investments | Marketable equity securities |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments | 2,300,000 | 2,800,000 |
Short-term Investments | Corporate bonds and debt |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 542,900,000 |
Short-term Investments | Time deposits |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 11,500,000 |
Short-term Investments | Municipal bonds - taxable |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 14,900,000 |
Short-term Investments | Fair Value, Inputs, Level 1 | Government agency bonds |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 0 |
Short-term Investments | Fair Value, Inputs, Level 1 | Marketable equity securities |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments | 2,300,000 | 2,800,000 |
Short-term Investments | Fair Value, Inputs, Level 1 | Corporate bonds and debt |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 0 |
Short-term Investments | Fair Value, Inputs, Level 1 | Time deposits |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 0 |
Short-term Investments | Fair Value, Inputs, Level 1 | Municipal bonds - taxable |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 0 |
Short-term Investments | Fair Value, Inputs, Level 2 | Government agency bonds |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 723,200,000 |
Short-term Investments | Fair Value, Inputs, Level 2 | Marketable equity securities |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments | $ 0 | 0 |
Short-term Investments | Fair Value, Inputs, Level 2 | Corporate bonds and debt |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 542,900,000 |
Short-term Investments | Fair Value, Inputs, Level 2 | Time deposits |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | 11,500,000 |
Short-term Investments | Fair Value, Inputs, Level 2 | Municipal bonds - taxable |  |  |
Fair Value, Assets and Liabilities, as Classified on the Condensed Consolidated Balance Sheets [Abstract] |  |  |
Investments |  | $ 14,900,000 |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=114001220&loc=d3e32787-111569 + Details
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