| Component: (Network and Table) | |
|---|---|
| Network | 2426407 - Disclosure - BUSINESS SEGMENTS (Long-Lived Assets by Geographic Area) (Details) (http://www.cmc.com/role/BusinessSegmentsLongLivedAssetsByGeographicAreaDetails) |
| Table | Schedule of Revenues from External Customers and Long-Lived Assets [Table] |
| Reporting Entity [Axis] | 0000022444 (http://www.sec.gov/CIK) |
| Revenues from External Customers and Long-Lived Assets [Line Items] | Period [Axis] | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2016-08-31 | 2015-08-31 | 2014-08-31 | |||||||||||||
| Geographical [Axis] | Geographical [Axis] | Geographical [Axis] | |||||||||||||
| United States | Europe | Asia | Australia/New Zealand | Geographical [Domain] | United States | Europe | Asia | Australia/New Zealand | Geographical [Domain] | United States | Europe | Asia | Australia/New Zealand | Geographical [Domain] | |
Long-Lived Assets | |||||||||||||||