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Long-Term Debt - Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Aggregate Future Principal Payments    
2022 (remaining six months ending March 31, 2022) $ 3,000  
2023 6,000  
2024 6,000  
2025 26,000  
2026 6,000  
Thereafter 1,573,000  
Total long-term debt (including current portion) $ 1,620,000 $ 1,495,000