Pensions and Other Postretirement Benefits (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
May 31, 2020 |
May 31, 2019 |
May 31, 2020 |
May 31, 2019 |
|
| Components of net periodic benefit cost | ||||
| Service cost | $ 74 | $ 67 | $ 221 | $ 213 |
| Interest cost | 112 | 172 | 338 | 528 |
| Expected return on plan assets | (98) | (104) | (294) | (325) |
| Amortization of prior service cost | 1 | 1 | 3 | 3 |
| Amortization of accumulated loss | 174 | 112 | 522 | 349 |
| Curtailment and settlement loss | 75 | 11 | 75 | 484 |
| Net periodic benefit cost | $ 338 | $ 259 | 865 | 1,252 |
| Employer contribution | $ 1,170 | $ 1,177 | ||