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Commitments And Contingencies (Tables)

3 Months Ended

Nov. 30, 2011

Commitments and Contingencies Disclosure [Abstract]

Environmental Remediation Liabilities

			September 30,				September 30,				September 30,
Environmental Remediation Liabilities
$ in thousands		November 30,				November 30,				August 31,
Balance Sheet Location		2011				2010				2011
Other current liabilities		$	2,899			$	1,339			$	1,540
Other noncurrent liabilities			5,200				—				—
Total environmental remediation liabilities		$	8,099			$	1,339			$	1,540

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