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Debt (Tables)
 12 Months Ended
Aug. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Debt
Long-term debt consists of the following at August 31:

 
2018
 
2017
Class A-2 2018-1 senior secured fixed rate notes
 
$
170,000

 
$
—

Class A-2 2016-1 senior secured fixed rate notes
 
399,911

 
422,521

Class A-1 2016-1 senior secured variable funding notes
 
—

 
60,000

Class A-2 2013-1 senior secured fixed rate notes
 
147,485

 
155,000


 
717,396

 
637,521

Less unamortized debt issuance costs
 
(11,668
)
 
(9,405
)
Less long-term debt due within one year
 
(4,250
)
 
—

Long-term debt, net
 
$
701,478

 
$
628,116