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Future Minimum Lease Payments for Noncancelable Operating Lease (Detail)
$ in Thousands
May. 31, 2015
USD ($)
Operating Leased Assets [Line Items]  
2016 $ 9,425
2017 8,276
2018 6,931
2019 5,796
2020 4,365
Thereafter 3,684
Total $ 38,477