XML 13 R46.htm IDEA: XBRL DOCUMENT v2.4.0.6
Commitments And Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2011
May 31, 2011
May 31, 2012
May 31, 2011
Aug. 31, 2011
Commitments And Contingencies [Abstract]          
Environmental remediation expense $ 7,200 $ 462 $ 7,225 $ 1,175  
Total environmental remediation liabilities   1,518 7,759 1,518 1,540
Other current liabilities   1,518 2,559 1,518 1,540
Other noncurrent liabilities     $ 5,200