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Fair Value of Financial Instruments - Estimated Fair Value and Carrying Value of 2019, 2020 and 2023 Notes (Detail) - USD ($) $ in Thousands | Feb. 02, 2019 | Feb. 03, 2018
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Convertible Senior Notes Due 2019 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Convertible senior notes, Fair Value | $ 334,756 | $ 324,866
Convertible senior notes, Carrying Value | 344,146 | 329,012
Convertible Senior Notes Due 2020 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Convertible senior notes, Fair Value | 260,258 | 261,047
Convertible senior notes, Carrying Value | 272,919 | $ 255,865
Convertible Senior Notes Due 2023 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Convertible senior notes, Fair Value | 230,684 |
Convertible senior notes, Carrying Value | $ 253,689 |

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