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COMMITMENTS AND CONTINGENCIES - Future Purchase Obligations (Details)
$ in Thousands
May 31, 2017
USD ($)
Purchase Obligation, Fiscal Year Maturity [Abstract]  
2018 $ 762,998
2019 88,483
2020 53,444
2021 32,266
2022 7,210
Thereafter 9,721
Total $ 954,122