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Leases (Components of Net Investment in Direct Financing Leases) (Details) - USD ($)
$ in Thousands
Aug. 31, 2017
Aug. 31, 2016
Leases [Abstract]    
Minimum lease payments receivable $ 18,156 $ 15,108
Less unearned income (5,932) (5,134)
Net investment in direct financing leases 12,224 9,974
Less amount due within one year (371) (115)
Amount due after one year $ 11,853 $ 9,859