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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

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