| Component: (Network and Table) | |
|---|---|
| Network | 2408402 - Disclosure - Impairment and Facility Closure Costs Impairment and Facility Closure Costs (Pretax Charges)(Details) (http://www.cmc.com/role/ImpairmentAndFacilityClosureCostsImpairmentAndFacilityClosureCostsPretaxChargesdetails) |
| Table | Schedule of Restructuring and Related Costs [Table] |
| Reporting Entity [Axis] | 0000022444 (http://www.sec.gov/CIK) |
| Statement, Operating Activities Segment [Axis] | Segment, Operating Activities [Domain] |
| Pre-tax charges relating to impairment and closure | Period [Axis] | |||
|---|---|---|---|---|
2011-09-01 - 2012-08-31 | 2010-09-01 - 2011-08-31 | 2009-09-01 - 2010-08-31 | ||
| Restructuring Type [Axis] | Restructuring Type [Axis] | Restructuring Type [Axis] | ||
| Type of Restructuring [Domain] | Pretax charges relating to Facility closure [Member] | Type of Restructuring [Domain] | Type of Restructuring [Domain] | |
Impairment of property, plant and equipment and other assets | 106,655,000 | |||
Impairment of customer list intangible asset | 12,140,000 | |||
Write-down of inventory | 13,917,000 | 8,500,000 | 25,503,000 | 53,203,000 |
Severance costs | 25,600,000 | 5,051,000 | 8,200,000 | 21,500,000 |
Lease termination costs | 2,196,000 | |||
Other closure costs | 7,700,000 | |||