Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
May 05, 2018	Apr. 29, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 28,059	$ (3,370)
Net losses from foreign currency translation	(1,265)	(1,192)
Net unrealized holding gains on available-for-sale investments		11
Total comprehensive income (loss)	$ 26,794	$ (4,551)

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Subparagraph (b,c)
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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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