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Debt - Convertible Senior Notes Due 2021 (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 15, 2015 USD ($) $ / shares shares | Sep. 09, 2015 USD ($) shares | Apr. 29, 2017 shares | Jan. 28, 2017 shares | Oct. 24, 2015 trading_day | Jan. 27, 2018 USD ($) shares | Jul. 29, 2017 USD ($) shares | Jul. 30, 2016 USD ($) shares | Jul. 25, 2015 USD ($) shares | Jul. 15, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  |  |  | $ 9,170,000 | $ 17,610,000 | $ 14,709,000 | $ 0 |
Stock Repurchased and Retired During Period, Value | $ 60,000,000 | $ 60,000,000 |  |  |  | $ 16,875,000 | $ 62,909,000 | $ 169,997,000 | $ 87,146,000 |
Repurchase of common stock, shares | shares | 805,000 | 805,000 | 400,000 | 313,006 |  | 200,000 | 713,006 | 2,511,578 | 1,669,924 |
Payments for Hedge, Financing Activities |  |  |  |  |  | $ 0 | $ 0 | $ 115,818,000 | $ 0 |
0.75% Convertible Senior Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 485,000,000.0 |  |  |  |  | $ 485,000,000 | $ 485,000,000 | $ 485,000,000 |  |
Debt, interest rate (in percent) |  |  |  |  |  | 0.75% | 0.75% | 0.75% |  |
Debt instrument conversion ratio | 0.0103211 |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion price (per share) | $ / shares | $ 96.89 |  |  |  |  |  |  |  |  |
Convertible debt, trading day threshold | trading_day |  |  |  |  | 20 |  |  |  |  |
Convertible debt, consecutive trading day threshold |  |  |  |  | 30 days |  |  |  |  |
Convertible debt, percentage of stock trigger price threshold |  |  |  |  | 130.00% |  |  |  |  |
Convertible debt, measurement period for percentage of product sale price of common stock and applicable conversion threshold |  |  |  |  | 98.00% |  |  |  |  |
Convertible debt, comparable yield |  |  |  |  |  | 5.50% |  |  |  |
Amortization of debt discount |  |  |  |  |  | $ 9,200,000 | $ 17,600,000 | $ 14,700,000 |  |
Convertible Debt |  |  |  |  |  | 402,249,000 | 392,233,000 | 373,077,000 |  |
Unamortized discount |  |  |  |  |  | 74,899,000 | 84,069,000 | 101,679,000 |  |
Debt issuance cost |  |  |  |  |  | $ 7,852,000 | $ 8,698,000 | $ 10,244,000 |  |
Proceeds from Convertible Debt | $ 471,700,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | 13,300,000 |  |  |  |  |  |  |  |  |
Payments for Hedge, Financing Activities | 41,100,000 |  |  |  |  |  |  |  |  |
Proceeds from Debt for General Corporate Purposes | 73,900,000 |  |  |  |  |  |  |  |  |
7.125% Senior Subordinated Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 277,500,000.0
Debt, interest rate (in percent) |  |  |  |  | 7.125% |  |  | 7.125% | 7.125% | 7.125%
Repayments of Debt | $ 296,600,000 |  |  |  |  |  |  |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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