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Fair Value of Financial Instruments - Narrative (Detail) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Nov. 01, 2015 | May. 03, 2015 | Nov. 02, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term investments | $ 3,279,000 | $ 2,415,000 | [1] | $ 1,911,000
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 gain (loss) on investments | (171,000) | $ (95,000) |  | $ (88,000)
Long-term Investments [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Unrealized gain (loss) on investments | $ 14,000 |  |  |
[1] | Derived from audited financial statements.

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