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Financial Assets and Liabilities - Financial assets measured at fair value (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value $ 697,887 $ 471,482
Debt Investments    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 673,867 448,212
Debt Investments | Municipal securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 2,700  
Debt Investments | U.S. treasury securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 294,103 101,563
Debt Investments | Agency securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 24,280 26,936
Debt Investments | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 15,399 24,126
Debt Investments | Commercial paper    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 31,937 94,035
Debt Investments | Corporate debt securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 305,448 201,552
Other non-current assets    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value   3,660
At fair value    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 1,759,751 1,419,378
Total liabilities measured at fair value 1,284,598 855,079
At fair value | Hedging | Derivatives | Current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 1,507 3,879
At fair value | Hedging | Derivatives | Non-current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 2 74
At fair value | Exchangeable feature of Notes | Derivatives | Current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 1,283,089 851,126
At fair value | Cash and cash equivalents | Money market funds    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 439,947 593,696
At fair value | Cash and cash equivalents | U.S. treasury securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 5,599 6,996
At fair value | Cash and cash equivalents | Agency securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 8,749 8,084
At fair value | Cash and cash equivalents | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value   9,844
At fair value | Cash and cash equivalents | Commercial paper    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 167,248 67,327
At fair value | Cash and cash equivalents | Corporate debt securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 27,365 7,560
At fair value | Debt Investments | Municipal securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 2,728  
At fair value | Debt Investments | U.S. treasury securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 296,118 101,759
At fair value | Debt Investments | Agency securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 24,586 26,966
At fair value | Debt Investments | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 12,052 20,466
At fair value | Debt Investments | Commercial paper    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 31,937 94,035
At fair value | Debt Investments | Corporate debt securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 308,651 201,820
At fair value | Derivatives | Current derivative | Hedging    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 16,879 559
At fair value | Derivatives | Current derivative | Capped Call    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 310,608 214,597
At fair value | Derivatives | Non-current derivative | Hedging    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value   77
At fair value | Other non-current assets | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 3,347  
At fair value | Other non-current assets | Marketable equity securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 100,187 58,932
At fair value | Other non-current assets | Non-marketable equity securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 3,750 3,000
At fair value | Level 1    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 540,134 652,628
Total liabilities measured at fair value 0 0
At fair value | Level 1 | Hedging | Derivatives | Current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 0 0
At fair value | Level 1 | Hedging | Derivatives | Non-current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 0 0
At fair value | Level 1 | Exchangeable feature of Notes | Derivatives | Current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 0 0
At fair value | Level 1 | Cash and cash equivalents | Money market funds    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 439,947 593,696
At fair value | Level 1 | Cash and cash equivalents | U.S. treasury securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Cash and cash equivalents | Agency securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Cash and cash equivalents | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value   0
At fair value | Level 1 | Cash and cash equivalents | Commercial paper    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Cash and cash equivalents | Corporate debt securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Debt Investments | Municipal securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0  
At fair value | Level 1 | Debt Investments | U.S. treasury securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Debt Investments | Agency securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Debt Investments | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Debt Investments | Commercial paper    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Debt Investments | Corporate debt securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Derivatives | Current derivative | Hedging    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Derivatives | Current derivative | Capped Call    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Derivatives | Non-current derivative | Hedging    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value   0
At fair value | Level 1 | Other non-current assets | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 1 | Other non-current assets | Marketable equity securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 100,187 58,932
At fair value | Level 1 | Other non-current assets | Non-marketable equity securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 2    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 905,259 549,153
Total liabilities measured at fair value 1,509 3,953
At fair value | Level 2 | Hedging | Derivatives | Current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 1,507 3,879
At fair value | Level 2 | Hedging | Derivatives | Non-current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 2 74
At fair value | Level 2 | Exchangeable feature of Notes | Derivatives | Current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 0 0
At fair value | Level 2 | Cash and cash equivalents | Money market funds    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 2 | Cash and cash equivalents | U.S. treasury securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 5,599 6,996
At fair value | Level 2 | Cash and cash equivalents | Agency securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 8,749 8,084
At fair value | Level 2 | Cash and cash equivalents | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value   9,844
At fair value | Level 2 | Cash and cash equivalents | Commercial paper    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 167,248 67,327
At fair value | Level 2 | Cash and cash equivalents | Corporate debt securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 27,365 7,560
At fair value | Level 2 | Debt Investments | Municipal securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 2,728  
At fair value | Level 2 | Debt Investments | U.S. treasury securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 296,118 101,759
At fair value | Level 2 | Debt Investments | Agency securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 24,586 26,966
At fair value | Level 2 | Debt Investments | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 12,052 20,466
At fair value | Level 2 | Debt Investments | Commercial paper    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 31,937 94,035
At fair value | Level 2 | Debt Investments | Corporate debt securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 308,651 201,820
At fair value | Level 2 | Derivatives | Current derivative | Hedging    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 16,879 559
At fair value | Level 2 | Derivatives | Current derivative | Capped Call    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0
At fair value | Level 2 | Derivatives | Non-current derivative | Hedging    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value   77
At fair value | Level 2 | Other non-current assets | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 3,347 3,660
At fair value | Level 2 | Other non-current assets | Marketable equity securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 2 | Other non-current assets | Non-marketable equity securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 314,358 217,597
Total liabilities measured at fair value 1,283,089 851,126
At fair value | Level 3 | Hedging | Derivatives | Current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 0 0
At fair value | Level 3 | Hedging | Derivatives | Non-current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 0 0
At fair value | Level 3 | Exchangeable feature of Notes | Derivatives | Current derivative    
Disclosure of fair value measurement of assets [line items]    
Total liabilities measured at fair value 1,283,089 851,126
At fair value | Level 3 | Cash and cash equivalents | Money market funds    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Cash and cash equivalents | U.S. treasury securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Cash and cash equivalents | Agency securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Cash and cash equivalents | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value   0
At fair value | Level 3 | Cash and cash equivalents | Commercial paper    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Cash and cash equivalents | Corporate debt securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Debt Investments | Municipal securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0  
At fair value | Level 3 | Debt Investments | U.S. treasury securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Debt Investments | Agency securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Debt Investments | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Debt Investments | Commercial paper    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Debt Investments | Corporate debt securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Derivatives | Current derivative | Hedging    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Derivatives | Current derivative | Capped Call    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 310,608 214,597
At fair value | Level 3 | Derivatives | Non-current derivative | Hedging    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value   0
At fair value | Level 3 | Other non-current assets | Certificates of deposit and time deposits    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Other non-current assets | Marketable equity securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value 0 0
At fair value | Level 3 | Other non-current assets | Non-marketable equity securities    
Disclosure of fair value measurement of assets [line items]    
Total assets measured at fair value $ 3,750 $ 3,000