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Subsequent Events (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Mar. 31, 2020	Jul. 31, 2019	Jun. 30, 2019	Mar. 31, 2019
Subsequent events
Cash and cash equivalents		$ 114,325		$ 132,476	$ 90,856
Total available-for-sale securities		281,728		130,824
Corporate investments
Subsequent events
Total available-for-sale securities		72,679		$ 30,022
Five-year revolving credit agreement \| Senior secured debt
Subsequent events
Term of credit agreement			5 years
Maximum borrowing capacity			$ 250,000
Amount borrowed		$ 0
Subsequent event \| VidGrid, Inc.
Subsequent events
Purchase price consideration	$ 17,500
Subsequent event \| Five-year revolving credit agreement \| Senior secured debt
Subsequent events
Amount borrowed	$ 100,000