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Commitments and Contingencies (Future Minimum Lease Payments) (Details)
$ in Thousands
Aug. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 126,038
2020 97,789
2021 81,286
2022 66,400
2023 49,309
Thereafter 142,089
Total minimum lease payments $ 562,911