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Financial Assets and Liabilities - Reconciliation of Level 3 financial instrument fair values (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Changes in fair value measurement, assets [abstract]    
Beginning balance $ 510,638  
Ending balance 783,356 $ 510,638
Level 3 | Capped Call    
Changes in fair value measurement, assets [abstract]    
Beginning balance 214,597 99,932
Purchases 0 0
Transfer out   0
Gains (losses) recognized in other comprehensive income   0
Ending balance 310,608 214,597
Change in unrealized gains (losses) relating to assets and liabilities held at end of period 96,011 114,665
Level 3 | Capped Call | Finance income    
Changes in fair value measurement, assets [abstract]    
Gains (losses) recognized in profit or loss   0
Level 3 | Capped Call | Other non-operating expense, net    
Changes in fair value measurement, assets [abstract]    
Gains (losses) recognized in profit or loss 96,011 114,665
Level 3 | Embedded exchange feature of Notes    
Changes in fair value measurement, liabilities [abstract]    
Beginning balance (851,126) (202,553)
Purchases 1 0
Transfer out   0
Gains (losses) recognised in other comprehensive income   0
Ending balance (1,283,089) (851,126)
Change in unrealized gains (losses) relating to liabilities held at end of period (431,964) (648,573)
Level 3 | Embedded exchange feature of Notes | Finance income    
Changes in fair value measurement, liabilities [abstract]    
Gains (losses) recognized in profit or loss   0
Level 3 | Embedded exchange feature of Notes | Other non-operating expense, net    
Changes in fair value measurement, liabilities [abstract]    
Gains (losses) recognized in profit or loss (431,964) (648,573)
Level 3 | Non-marketable equity securities    
Changes in fair value measurement, assets [abstract]    
Beginning balance 3,000 0
Purchases 750 23,000
Transfer out   (20,942)
Gains (losses) recognized in other comprehensive income   672
Ending balance 3,750 3,000
Change in unrealized gains (losses) relating to assets and liabilities held at end of period 0 0
Level 3 | Non-marketable equity securities | Finance income    
Changes in fair value measurement, assets [abstract]    
Gains (losses) recognized in profit or loss   270
Level 3 | Non-marketable equity securities | Other non-operating expense, net    
Changes in fair value measurement, assets [abstract]    
Gains (losses) recognized in profit or loss $ 0 $ 0