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Guarantees - Additional Information (Detail)
Aug. 31, 2015
USD ($)
Loss Contingencies [Line Items]  
Letter of credit amount outstanding $ 16,189,000
Letter of credit amount drawn 0
Operating Lease of Aircraft  
Loss Contingencies [Line Items]  
Maximum potential obligation 11,433,000
Term Loan  
Loss Contingencies [Line Items]  
Maximum potential obligation $ 1,250,000