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Debt - Convertible Note Hedge and Warrant Transactions (Details) - $ / shares shares in Thousands | Sep. 15, 2015 | Jul. 31, 2021
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Convertible senior notes |  |
Debt Instrument [Line Items] |  |
Anti-dilutive weighted shares excluded from the calculation, per share conversion price, threshold (in dollars per share) |  | $ 96.89
Note Warrant |  |
Debt Instrument [Line Items] |  |
Anti-dilutive weighted shares excluded from the calculation, per share conversion price, threshold (in dollars per share) |  | $ 130.43
0.75% Convertible Senior Notes Due 2021 |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |
Warrant |  |
Debt Instrument [Line Items] |  |
Class of Warrant or Right, Unissued (shares) |  | 601
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares) | 5,006 |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition The number of warrants or rights which entitle the entity to receive future services in exchange for the unvested, forfeitable warrants or rights. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + 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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