Investments - Held-To-Maturity Securities (Details) - USD ($) $ in Thousands	Jul. 27, 2019	Apr. 30, 2019
Held To Maturity Securities
Amortized Cost	$ 165,828	$ 159,873
Gross Unrealized Gains	174	100
Gross Unrealized Losses	(17)	(58)
Fair Value	165,985	159,915
Municipal securities
Held To Maturity Securities
Amortized Cost	7,873	5,332
Gross Unrealized Gains	2	2
Gross Unrealized Losses		(1)
Fair Value	7,875	5,333
U.S. government securities
Held To Maturity Securities
Amortized Cost	82,695	70,609
Gross Unrealized Gains	129	78
Gross Unrealized Losses	(11)	(52)
Fair Value	82,813	70,635
Corporate bonds
Held To Maturity Securities
Amortized Cost	75,260	83,932
Gross Unrealized Gains	43	20
Gross Unrealized Losses	(6)	(5)
Fair Value	$ 75,297	$ 83,947

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

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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
-SubTopic 10
-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)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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