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Marketable Securities - Maturity Period (Details) $ in Thousands | 2 Months Ended
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Sep. 30, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |
Due within one year | $ 38,139
Variable rate demand notes |
Debt Securities, Available-for-sale [Line Items] |
Due within one year | $ 8,700
Variable rate demand notes | Minimum |
Debt Securities, Available-for-sale [Line Items] |
Contractual maturities (in years) | 19 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) | 31 years
Settlement basis period (in days) | 7 days
Effective maturity period (in days) | 7 days

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