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Marketable Securities & Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0  
Equity Securities without Readily Determinable Fair Value, Amount 6,306 $ 5,593
Other-than-temporary impairments 0  
FuturePaymentsToAcquireLongtermInvestments $ 2,250