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Debt - Convertible Senior Notes Due 2021 (Details) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 15, 2015 USD ($) $ / shares | Oct. 30, 2021 USD ($) | May 01, 2021 USD ($) | Oct. 24, 2020 USD ($) | Oct. 28, 2017 trading_day | Oct. 30, 2021 USD ($) | Oct. 24, 2020 USD ($) | Jan. 30, 2021 USD ($) | Jan. 25, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amortization of debt discount |  |  |  |  |  | $ 1,665,000 | $ 6,732,000 |  |
Repayments of Long-term Lines of Credit |  |  |  |  |  | 271,875,000 | 704,875,000 |  |
(Loss) gain on debt extinguishment |  |  |  |  |  | $ (62,000) | 12,046,000 |  |
0.75% Convertible Senior Notes Due 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt, interest rate (in percent) |  | 0.75% |  |  |  | 0.75% |  |  |
Debt intrument, conversion installments amount | $ 1,000 |  |  |  |  |  |  |  |
Debt instrument,conversion ratio | 10.3211 |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 485,000,000 | $ 58,300,000 |  |  |  | $ 58,300,000 |  | $ 58,264,000 | $ 460,000,000
Debt instrument, convertible, conversion price (per share) | $ / shares | $ 96.89 |  |  |  |  |  |  |  |
Convertible debt, trading day threshold | trading_day |  |  |  |  | 20 |  |  |  |
Convertible debt, consecutive trading day threshold | trading_day |  |  |  |  | 30 |  |  |  |
Convertible debt, percentage of stock trigger price threshold |  |  |  |  | 130.00% |  |  |  |
Debt instrument conversion trigger price | $ / shares | $ 125.96 |  |  |  |  |  |  |  |
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 |  | $ 300,000 |  | $ 600,000 |  | 1,700,000 | $ 6,700,000 |  |
Convertible Debt |  |  |  |  |  |  |  | 56,410,000 |
Unamortized discount |  |  |  |  |  |  |  | 1,665,000 |
Debt issuance cost |  |  |  |  |  |  |  | $ 189,000 |
Repayments of Long-term Lines of Credit |  | $ 371,400,000 | $ 24,300,000 |  |  |  |  |  |
(Loss) gain on debt extinguishment |  |  | $ 100,000 |  |  | $ (12,000,000) |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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