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Future Minimum Lease Payments for Noncancelable Operating Lease (Detail)
$ in Thousands
May 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 9,951
2019 9,259
2020 6,605
2021 4,820
2022 3,041
Thereafter 6,784
Total $ 40,460