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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 01, 2019 | Jan. 31, 2019
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Accounting Policies [Abstract] |  |  |  |
Equity investments in privately-held companies |  | $ 15,500,000 |  | $ 0
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease right-of-use assets | $ 143,361,000 |  |  |
Operating lease liabilities | 171,699,000 |  |  |
Derecognition related to build-to-suit asset | (84,094,000) |  |  | $ (75,832,000)
Accounting Standards Update 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease right-of-use assets |  |  | $ 93,900,000 |
Operating lease liabilities |  |  | 121,800,000 |
Deferred rent |  |  | 26,600,000 |
Israel Leased Property | Other Capitalized Property Plant and Equipment | Accounting Standards Update 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Derecognition related to build-to-suit asset | $ 2,500,000 |  |  |
Derecognition related to build-to-suit liability |  |  | $ 2,500,000 |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -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 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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