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Fair Value of Financial Instruments - Narrative (Detail) - USD ($) | Jul. 31, 2016 | May 01, 2016 | Aug. 02, 2015
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Short-term investments | $ 2,434,000 | $ 4,359,000 | [1] | $ 6,336,000
Long-term investments | 4,611,000 | 4,025,000 | [1] | 2,893,000
Short-term Investments [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Unrealized gain (loss) on investments | (33,000) | (100,000) |  | $ (184,000)
Long-term Investments [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Unrealized gain (loss) on investments | $ (15,000) | $ (44,000) |  |
[1] | Derived from audited financial statements.

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