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Debt - Convertible Note Hedge and Warrant Transactions (Details) - USD ($) $ / shares in Units, shares in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 15, 2015 | Jan. 27, 2018 | Jan. 25, 2020 | Jan. 26, 2019 | Jul. 29, 2017
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from borrowings on senior credit agreement, including term loans |  | $ 0 | $ 475,000,000 | $ 423,188,000 | $ 707,000,000
Convertible Note Hedge |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, convertible, conversion price (per share) | $ 96.89 |  | $ 96.89 | $ 96.89 |
Payment for financing derivatives | $ 115,800,000 |  |  |  |
Proceeds from borrowings on senior credit agreement, including term loans |  |  | $ 25,000,000 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares) | 4,748 |  |  |  |
Deferred tax liability | $ 43,400,000 |  |  |  |
Deferred tax asset, derivative instrument | 43,200,000 |  |  |  |
0.75% Convertible Senior Notes Due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 485,000,000.0 |  | $ 460,000,000.0 | $ 485,000,000 |
Debt instrument, convertible, conversion price (per share) | $ 96.89 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares) |  |  | 4,748 | 5,006 |
Class of warrant or right, exercise price of warrants or rights (per warrant) |  |  | $ 130.43 |  |
Warrant Transaction |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from borrowings on senior credit agreement, including term loans |  |  | $ 25,000,000 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares) | 4,748 |  |  | 5,006 |
Class of warrant or right, exercise price of warrants or rights (per warrant) | $ 130.43 |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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