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Financial Assets and Liabilities - Investments measured at fair value (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Disclosure of financial assets [line items]    
Amortized Cost $ 697,887 $ 471,482
Unrealized Gains 85,473 39,190
Unrealized Losses (4) (34)
Fair Value 783,356 510,638
Debt Investments    
Disclosure of financial assets [line items]    
Amortized Cost 673,867 448,212
Unrealized Gains 5,556 528
Unrealized Losses (4) (34)
Fair Value 679,419 448,706
Debt Investments | U.S. treasury securities    
Disclosure of financial assets [line items]    
Amortized Cost 294,103 101,563
Unrealized Gains 2,017 203
Unrealized Losses (2) (7)
Fair Value 296,118 101,759
Debt Investments | Agency securities    
Disclosure of financial assets [line items]    
Amortized Cost 24,280 26,936
Unrealized Gains 306 33
Unrealized Losses 0 (3)
Fair Value 24,586 26,966
Debt Investments | Certificates of deposit and time deposits    
Disclosure of financial assets [line items]    
Amortized Cost 15,399 24,126
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 15,399 24,126
Debt Investments | Commercial paper    
Disclosure of financial assets [line items]    
Amortized Cost 31,937 94,035
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 31,937 94,035
Debt Investments | Corporate debt securities    
Disclosure of financial assets [line items]    
Amortized Cost 305,448 201,552
Unrealized Gains 3,205 292
Unrealized Losses (2) (24)
Fair Value 308,651 201,820
Debt Investments | Municipal securities    
Disclosure of financial assets [line items]    
Amortized Cost 2,700  
Unrealized Gains 28  
Unrealized Losses 0  
Fair Value 2,728  
Equity Investments    
Disclosure of financial assets [line items]    
Amortized Cost 24,020 23,270
Unrealized Gains 79,917 38,662
Unrealized Losses 0 0
Fair Value 103,937 61,932
Equity Investments | Marketable equity securities    
Disclosure of financial assets [line items]    
Amortized Cost 20,270 20,270
Unrealized Gains 79,917 38,662
Unrealized Losses 0 0
Fair Value 100,187 58,932
Equity Investments | Non-marketable equity securities    
Disclosure of financial assets [line items]    
Amortized Cost 3,750 3,000
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value $ 3,750 $ 3,000