The Company and Its Significant Accounting Policies - Schedule of Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2018
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net cash used in operating activities		$ (4,430)	$ (3,949)	[1]	$ (8,356)	[1]
Net cash used in investing activities		(249,487)	(96,106)	[1]	(417,822)	[1]
Net cash provided by financing activities		863,126	491,655	[1]	326,282	[1]
Net increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents		609,209	391,600	[1]	(99,896)	[1]
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of year	[1]	983,168	591,568		691,464
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of year		1,592,377	983,168	[1]	591,568	[1]
AS Previously Reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net cash used in operating activities			(3,949)		(8,356)
Net cash used in investing activities			(419,801)		(335,421)
Net cash provided by financing activities			491,655		326,282
Net increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents			67,905		(17,495)
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of year		90,306	22,401		39,896
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of year			90,306		22,401
Revision of Prior Period, Adjustment | ASU No. 2016-18
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Net cash used in investing activities			323,695		(82,401)
Net increase (decrease) in cash, cash equivalents, restricted cash, and restricted cash equivalents			323,695		(82,401)
Cash, cash equivalents, restricted cash, and restricted cash equivalents, beginning of year		$ 892,862	569,167		651,568
Cash, cash equivalents, restricted cash, and restricted cash equivalents, end of year			$ 892,862		$ 569,167

[1] Amounts have been adjusted to reflect the adoption of Accounting Standards Update No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. See Note 1 to the consolidated financial statements for a summary of reclassifications and adjustments.