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Commitments and Contingencies (Future Minimum Unconditional Purchase Obligations) (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2022 $ 404,051
2023 36,292
2024 7,048
2025 1,333
2026 2,173
Thereafter 899
Total $ 451,796