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Fair Value of Financial Instruments - Narrative (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Aug. 02, 2015 | May. 03, 2015 | Aug. 03, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term investments | $ 2,893,000 | $ 2,415,000 | [1] | $ 1,749,000
Minimum [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Short-term investments, maturity period | 3 months |  |  |
Short-term Investments [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Short-term bond funds | $ 6,300,000 | 10,000,000 |  | 6,300,000
Unrealized loss on short-term bond funds | $ (184,000) | $ (95,000) |  | $ (70,000)
[1] | Derived from audited financial statements.

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