Investments - Held-To-Maturity Securities (Details) - USD ($) $ in Thousands	Oct. 26, 2019	Apr. 30, 2019
Held To Maturity Securities
Amortized Cost	$ 170,166	$ 159,873
Gross Unrealized Gains	203	100
Gross Unrealized Losses	(17)	(58)
Fair Value	170,352	159,915
Municipal securities
Held To Maturity Securities
Amortized Cost	26,776	5,332
Gross Unrealized Gains		2
Gross Unrealized Losses	(6)	(1)
Fair Value	26,770	5,333
U.S. government securities
Held To Maturity Securities
Amortized Cost	65,826	70,609
Gross Unrealized Gains	150	78
Gross Unrealized Losses		(52)
Fair Value	65,976	70,635
Corporate bonds
Held To Maturity Securities
Amortized Cost	76,543	83,932
Gross Unrealized Gains	52	20
Gross Unrealized Losses	(11)	(5)
Fair Value	76,584	$ 83,947
Certificates of deposit
Held To Maturity Securities
Amortized Cost	1,021
Gross Unrealized Gains	1
Fair Value	$ 1,022

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=118954083&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=118939692&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=118939692&loc=d3e27232-111563

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