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Fair Value of Financial Instruments - Narrative (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
May. 03, 2015 | Jan. 31, 2016 | Feb. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Short-term investments | $ 10,004,000 | [1] | $ 4,259,000 | $ 8,384,000
Long-term investments | $ 2,415,000 | [1] | 3,590,000 | 2,063,000
Minimum [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Short-term investments, deposit account maturity period | 3 months |  |  |
Bank Deposit [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Deposit account | $ 1,600,000 |  |  |
Short-term Investments [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Short-term bond funds | 8,400,000 |  | 4,300,000 | 8,400,000
Unrealized gain (loss) on investments | $ (95,000) |  | (181,000) | $ (66,000)
Long-term Investments [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Unrealized gain (loss) on investments |  |  | $ (99,000) |
[1] | Derived from audited financial statements.

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