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 |