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Marketable Securities - Available-for-sale by Maturity Date (Details) $ in Thousands	Apr. 30, 2016 USD ($)
Schedule of Available-for-sale Securities
Less than 12 months	$ 7,650
Greater than 12 months	17,022
Total	24,672
Certificates of deposit
Schedule of Available-for-sale Securities
Less than 12 months	7,650
Greater than 12 months	7,277
Total	14,927
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Less than 12 months	0
Greater than 12 months	8,522
Total	8,522
Municipal obligations
Schedule of Available-for-sale Securities
Less than 12 months	0
Greater than 12 months	1,223
Total	$ 1,223

X

- Definition

Available-for-sale Securities, Debt Maturities, After One Year, Fair Value

+ References

No definition available.

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- Definition

Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section 50
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-Name Accounting Standards Codification
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Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

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