Commitments and Contingencies (Details) (USD $)
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9 Months Ended | 9 Months Ended | 0 Months Ended | 0 Months Ended | |||||||||||||||
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May 31, 2013
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Aug. 31, 2012
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May 31, 2013
Metals Recycling Business
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May 31, 2013
Auto Parts Business
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May 31, 2013
Steel Manufacturing Business [Member]
T
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May 31, 2013
Portland Harbor Superfund Site [Member]
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Mar. 30, 2012
Portland Harbor Superfund Site [Member]
alternatives
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May 31, 2013
Other Metals Recycling Business Sites [Member]
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Mar. 30, 2012
Minimum [Member]
Portland Harbor Superfund Site [Member]
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May 31, 2013
Minimum [Member]
Portland Harbor Superfund Site [Member]
potentially_responsible_party
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Mar. 30, 2012
Maximum [Member]
Portland Harbor Superfund Site [Member]
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Mar. 30, 2012
Lower Willamette Group [Member]
Portland Harbor Superfund Site [Member]
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Mar. 30, 2012
Potential Responsible Parties [Member]
Minimum [Member]
Portland Harbor Superfund Site [Member]
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Mar. 30, 2012
Potential Responsible Parties [Member]
Maximum [Member]
Portland Harbor Superfund Site [Member]
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Loss Contingencies [Line Items] | |||||||||||||||||||
Accrual for Environmental Loss Contingencies, Increase (Decrease) for Acquisitions and Divestitures | $ 3,000,000 | ||||||||||||||||||
Accrual for Environmental Loss Contingencies [Roll Forward] | |||||||||||||||||||
Beginning balance | 47,059,000 | 30,859,000 | 16,200,000 | 1,000,000 | 30,000,000 | ||||||||||||||
Liabilities Established (Released), Net(1) | 2,359,000 | [1] | (92,000) | [1] | 2,451,000 | [1] | |||||||||||||
Payments and Other | (181,000) | (181,000) | 0 | ||||||||||||||||
Ending balance | 49,237,000 | 30,586,000 | 18,651,000 | 0 | 1,000,000 | 30,000,000 | |||||||||||||
Short-Term | 2,243,000 | 2,185,000 | 1,689,000 | 554,000 | |||||||||||||||
Long-Term | 46,994,000 | 44,874,000 | 28,897,000 | 18,097,000 | |||||||||||||||
Number Of Potentially Responsible Parties | 80 | ||||||||||||||||||
Site Contingency Period Of Feasibility Study | 10 years | ||||||||||||||||||
Site Contingency, Estimated Time Frame to Remediate | 2 years | 28 years | |||||||||||||||||
Feasibility Study Investigation Costs | 100,000,000 | ||||||||||||||||||
Site Contingency Number of Remedial Alternatives | 10 | ||||||||||||||||||
Site Contingency Least Costly Remediation Plan | 170,000,000 | 250,000,000 | |||||||||||||||||
Site Contingency Most Costly Remediation Plan | $ 1,080,000,000 | $ 1,760,000,000 | |||||||||||||||||
Annual production capacity (in tons) | 950,000 | ||||||||||||||||||
Permit Expiration Date | Feb. 01, 2018 | ||||||||||||||||||
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