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Fair Value Measurements (Tables) | 9 Months Ended
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May 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of Carrying Value and Estimated Fair Value of Financial Instruments | The carrying values and estimated fair values of certain of our financial instruments were as follows at May 31, 2019 and August 31, 2018 (in millions):
| May 31, 2019 |  | August 31, 2018
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Senior unsecured public notes, net of unamortized discount and deferred costs | $ | 349.8 |  |  | $ | 355.1 |  |  | $ | 349.5 |  |  | $ | 361.7 |
Industrial revenue bond | 4.0 |  |  | 4.0 |  |  | 4.0 |  |  | 4.0 |
Bank loans | 2.8 |  |  | 3.0 |  |  | 3.3 |  |  | 3.3 |

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