Investments - Held-To-Maturity Securities (Details) - USD ($) $ in Thousands	Oct. 27, 2018	Apr. 30, 2018
Held To Maturity Securities
Amortized Cost	$ 168,995	$ 152,163
Gross Unrealized Gains	5	11
Gross Unrealized Losses	(359)	(474)
Fair Value	168,641	151,700
Municipal securities
Held To Maturity Securities
Amortized Cost	15,319	37,390
Gross Unrealized Gains		9
Gross Unrealized Losses	(12)	(36)
Fair Value	15,307	37,363
U.S. government securities
Held To Maturity Securities
Amortized Cost	63,694	58,976
Gross Unrealized Gains	3
Gross Unrealized Losses	(271)	(367)
Fair Value	63,426	58,609
Corporate bonds
Held To Maturity Securities
Amortized Cost	84,982	55,797
Gross Unrealized Gains	2	2
Gross Unrealized Losses	(76)	(71)
Fair Value	84,908	$ 55,728
Certificates of deposit
Held To Maturity Securities
Amortized Cost	5,000
Fair Value	$ 5,000

Amount of accumulated unrealized gains on investments in debt securities classified as held-to-maturity.

No definition available.

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- Definition

Amount of accumulated unrealized losses on investments in debt securities classified as held-to-maturity.

+ References

No definition available.

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- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
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