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Related Party Transactions (Other Discussion) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Related Party Transaction [Line Items]          
Initial stated term     10 years    
Term of right to use The Garden     35 years    
Capital expenditures incurred but not yet paid     $ 206,462 $ 110,428 $ 81,322
BCE          
Related Party Transaction [Line Items]          
Notes payable due to related parties $ 792   875 792  
Nonconsolidated affiliates          
Related Party Transaction [Line Items]          
Capital expenditures     $ 121,115 $ 66,525  
Capital expenditures incurred but not yet paid $ 25,028 $ 6,921