Segment Information - Additional Information (Details) $ in Millions |
3 Months Ended | 12 Months Ended | |||
---|---|---|---|---|---|
Aug. 31, 2018
USD ($)
jointventureinterest
|
Aug. 31, 2019 |
Aug. 31, 2018
jointventureinterest
|
Aug. 31, 2017 |
Aug. 31, 2020
jointventureinterest
|
|
Segment Reporting Information [Line Items] | |||||
Number of equity method investments | 2 | ||||
Equity method investment, ownership percentage | 50.00% | ||||
Customer Concentration Risk | Sales | |||||
Segment Reporting Information [Line Items] | |||||
Concentration risk, percentage, no external customer that accounted for revenues over | 10.00% | 10.00% | 10.00% | ||
Corporate | |||||
Segment Reporting Information [Line Items] | |||||
Environmental remediation expense | $ | $ 1 | ||||
AMR | |||||
Segment Reporting Information [Line Items] | |||||
Number of equity method investments | 2 | 2 | |||
Equity method investment, ownership percentage | 50.00% | 50.00% | |||
Number of joint venture investments | 1 | ||||
Number of equity method investments, divested in the period | 2 | ||||
CSS | |||||
Segment Reporting Information [Line Items] | |||||
Number of joint venture investments | 1 |