Short-Term Investments - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	$ 512,580	$ 123,395
Short-term investments, Gross unrealized gains	97	590
Short-term investments, Gross unrealized losses	(157)	(11)
Short-term investments	512,520	123,974
Corporate Bonds
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	396,301	70,781
Short-term investments, Gross unrealized gains	50	360
Short-term investments, Gross unrealized losses	(150)	(10)
Short-term investments	396,201	71,131
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	84,193	28,281
Short-term investments, Gross unrealized gains	22	88
Short-term investments, Gross unrealized losses		(1)
Short-term investments	84,215	28,368
Asset-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	28,314	24,333
Short-term investments, Gross unrealized gains	24	142
Short-term investments, Gross unrealized losses	(6)
Short-term investments	28,332	$ 24,475
Certificates of Deposit
Schedule Of Available For Sale Securities [Line Items]
Short-term investments, Amortized cost	3,772
Short-term investments, Gross unrealized gains	1
Short-term investments, Gross unrealized losses	(1)
Short-term investments	$ 3,772