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The Company and Significant Accounting Policies - Basis of Presentation Narrative (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]      
Property and equipment purchased but not yet paid (fiscal year 2019 and 2018 amounts are presented as revised, see Note 1) $ 17,370 $ 44,799 $ 66,063
Revision of Prior Period, Error Correction, Adjustment      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Property and equipment purchased but not yet paid (fiscal year 2019 and 2018 amounts are presented as revised, see Note 1)   (14,100) (2,100)
Previously Reported      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Property and equipment purchased but not yet paid (fiscal year 2019 and 2018 amounts are presented as revised, see Note 1)   $ 58,900 $ 68,200