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Financial Instruments - Carrying value of long-term debt and estimated fair value of long-term debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Jun. 30, 2022
Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 10,845,359 $ 10,145,077
Estimated fair value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 10,221,563 $ 9,709,407