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Goodwill and Intangible Assets (Details 2) - USD ($)
$ in Thousands
May 31, 2018
May 31, 2017
Expected amortization expense    
2019 $ 16,555  
2020 15,001  
2021 13,842  
2022 12,958  
2023 12,507  
2024 and thereafter 59,447  
Net carrying value, finite-lived intangible assets $ 130,310 $ 145,675