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Marketable Securities - Maturity Period (Details) $ in Thousands	5 Months Ended
	Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items]
Due within one year	$ 37,121
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Due within one year	$ 4,000
Variable rate demand notes | Minimum
Debt Securities, Available-for-sale [Line Items]
Contractual maturities (in years)	27 years
Settlement basis period (in days)	1 day
Effective maturity period (in days)	1 day
Variable rate demand notes | Maximum
Debt Securities, Available-for-sale [Line Items]
Contractual maturities (in years)	30 years
Settlement basis period (in days)	7 days
Effective maturity period (in days)	9 days

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- Definition

Represents the contractual maturity period of available for sale securities debt securities.

+ References

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- Definition

Represents the effective maturity period of available for sale securities debt securities.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
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-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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