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Derivatives, Investments, and Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Nov. 30, 2019
Aug. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Domestic equity funds $ 444 $ 373
International equity funds 104 101
Fixed income funds 163 155
Interest rate swap contract   90
Total assets at fair value 711 719
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Domestic equity funds 345 288
International equity funds 37 45
Fixed income funds 53 54
Interest rate swap contract   0
Total assets at fair value 435 387
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Domestic equity funds 99 85
International equity funds 67 56
Fixed income funds 110 101
Interest rate swap contract   90
Total assets at fair value 276 332
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Domestic equity funds 0 0
International equity funds 0 0
Fixed income funds 0 0
Interest rate swap contract   0
Total assets at fair value $ 0 $ 0