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Goodwill, Service Contracts and Other Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Goodwill, Service Contracts And Other Assets [Abstract]        
Amortization expense for service contracts and other assets $ 35,600 $ 35,700 $ 106,000 $ 105,600
2021 (remaining three months) 35,595   35,595  
2022 133,539   133,539  
2023 114,282   114,282  
2024 101,952   101,952  
2025 88,837   88,837  
Thereafter 257,590   257,590  
Total future amortization expense $ 731,795   $ 731,795