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Fair Value of Financial Instruments - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 29, 2017	Oct. 30, 2016	Oct. 30, 2016	Oct. 29, 2017	Apr. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments - Available for Sale		$ 2,430,000	$ 2,430,000	$ 2,478,000	$ 2,443,000	[1]
Held to maturity investments		31,000,000	31,000,000
Purchase of long-term investments (Held-To-Maturity)			31,050,000
Held to maturity investments, fair value		31,000,000	31,000,000	30,800,000	30,800,000
Long-term investments (Rabbi Trust)		4,994,000	4,994,000	6,921,000	5,466,000	[1]
U.S. Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to maturity investments		$ 7,100,000	7,100,000	30,900,000	30,900,000
Purchase of long-term investments (Held-To-Maturity)	$ 23,900,000
U.S. Corporate Bonds [Member] | Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments, maturity period		2 years
U.S. Corporate Bonds [Member] | Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term investments, maturity period		2 years 6 months
Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accumulated unrealized gain (loss) on long-term investments		$ (45,000)	(45,000)	(36,000)	(47,000)
Cash and Cash Equivalents [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to maturity investments		23,900,000	23,900,000
Long-term investments (Rabbi Trust) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accumulated unrealized gain (loss) on long-term investments		$ 1,000	$ 1,000	$ 96,000	$ 43,000
[1] Derived from audited financial statements.

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Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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