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Debt Convertible Senior Notes Due 2021 (Details) $ / shares in Units, $ in Thousands |  | 2 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 15, 2015 USD ($) $ / shares shares | Sep. 11, 2015 USD ($) | Jan. 28, 2017 USD ($) shares | Apr. 23, 2016 shares | Jan. 23, 2016 USD ($) | Oct. 24, 2015 USD ($) trading_day shares | Jan. 28, 2017 USD ($) | Jan. 23, 2016 USD ($) | Jul. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased and retired during period, value | $ 60,000 | $ 110,000 |  |  |  |  |  |  |
Stock repurchased and retired during period, shares | shares | 805,000 |  | 313,006 | 1,557,354 |  | 954,224 |  |  |
Payments for Hedge, Financing Activities |  |  |  |  |  |  | $ 0 | $ 115,818 |
Amortization of debt discount |  |  |  |  |  |  | 8,686 | 5,928 |
0.75% Convertible Senior Notes Due 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 485,000 |  | $ 485,000 |  |  |  | $ 485,000 |  | $ 485,000
Proceeds from Convertible Debt | 471,700 |  |  |  |  |  |  |  |
Payments for Hedge, Financing Activities | 41,100 |  |  |  |  |  |  |  |
Proceeds from Debt for General Corporate Purposes | $ 73,900 |  |  |  |  |  |  |  |
Debt, interest rate (in percent) |  |  | 0.75% |  |  |  | 0.75% |  | 0.75%
Debt Instrument, Convertible, Conversion Ratio | 0.0103211 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (per share) | $ / shares | $ 96.89 |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | trading_day |  |  |  |  |  | 20 |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days |  |  |  |  |  | 30 days |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  |  |  |  | 130.00% |  |  |
Debt Instrument, Convertible, Measurement Period, Threshold Consecutive Business Days |  |  |  |  |  | 5 days |  |  |
Debt Instrument, Convertible, Measurement Period, Threshold Consecutive Trading Days |  |  |  |  |  | 5 days |  |  |
Debt Instrument, Convertible, Measurement Period, Threshold Percentage of Product of Sale Price of Common Stock and Applicable Conversion Rate |  |  |  |  |  | 98.00% |  |  |
Debt Instrument, Comparable Yield |  |  | 5.50% |  |  |  |  |  |
Amortization of debt discount |  |  | $ 4,400 |  | $ 4,100 |  | $ 8,700 | $ 5,900 |
Long-term Debt, Fair Value |  |  | 425,200 |  |  |  | 425,200 |  | $ 458,700
Convertible Debt |  |  | 382,513 |  |  |  | 382,513 |  | 373,077
Debt Instrument, Unamortized Discount |  |  | (92,993) |  |  |  | (92,993) |  | (101,679)
Unamortized Debt Issuance Expense | $ 15,100 |  | $ 9,494 |  |  |  | $ 9,494 |  | $ 10,244
7.125% Senior Subordinated Notes Due 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  | $ 296,600 |  |  |
Debt, interest rate (in percent) |  |  |  |  |  |  |  |  | 7.125%

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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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