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Notes Payable, Net - Principal Payments on Notes Payable (Detail) - USD ($)
$ in Thousands
Aug. 31, 2018
Aug. 31, 2017
Debt Instrument [Line Items]    
2019 $ 26,775  
2020 167,086  
2021 413  
2022 413  
2023 34  
Thereafter [1] 275,000  
Notes payable, gross $ 469,721 $ 597,604
[1] The repayment of the $275.0 million of Convertible senior notes due 2024 is assumed to occur at the scheduled maturity in 2024 instead of assuming an earlier conversion by the holders.