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Debt - Convertible Note Hedge and Warrant Transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 15, 2015 | Jul. 29, 2017 | Jul. 30, 2016 | Jul. 25, 2015
Debt Instrument [Line Items] |  |  |  |
Purchase of convertible note hedges |  | $ 0 | $ 115,818 | $ 0
Proceeds from sale of warrants |  | $ 0 | $ 74,690 | $ 0
Convertible Note Hedge |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Derivative, Number of Instruments Held | 5,006 |  |  |
Debt instrument, convertible, conversion price (per share) | $ 96.89 | $ 96.89 |  |
Purchase of convertible note hedges | $ 115,800 |  |  |
Deferred Tax Liabilities, Derivatives | 43,400 |  |  |
Deferred Tax Assets, Derivative Instruments | $ 43,200 |  |  |
0.75% Convertible Senior Notes Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, convertible, conversion price (per share) | $ 96.89 |  |  |
Purchase of convertible note hedges | $ 41,100 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares) | 5,006 |  |  |
Class of earrant or right, exercise price of warrants or rights (per warrant) | $ 130.43 | $ 130.43 |  |
Proceeds from sale of warrants | $ 74,700 |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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- Definition The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3581-108585 + Details
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