The Company tests for impairment of goodwill by estimating the fair value of each reporting unit compared to its carrying value. The Company’s reporting units are based on its internal reporting structure and represent an operating segment or a reporting level below an operating segment. Additionally, the reporting units are aggregated based upon similar economic characteristics, nature of products and services, nature of production processes, type of customers and distribution methods. The Company has determined its operating units that have a significant amount of goodwill to be in the Americas Recycling and Americas Fabrication segments. The Company uses a discounted cash flow model to calculate the fair value of its reporting units. The model includes a number of significant assumptions and estimates regarding future cash flows including discount rates, volumes, prices, capital expenditures and the impact of current market conditions. These estimates could be materially impacted by adverse changes in market conditions. The Company performs the goodwill impairment test in the fourth quarter each fiscal year and when changes in circumstances indicate an impairment event may have occurred. There were no triggering events during the third quarter of 2011.

The total gross carrying amounts of the Company’s intangible assets that were subject to amortization were $70.1 million and $73.9 million at May 31, 2011 and August 31, 2010, respectively, and are included in other noncurrent assets. Aggregate amortization expense for intangible assets for the three months ended May 31, 2011 and 2010 was $2.4 million and $2.7 million, respectively. Aggregate amortization expense for intangible assets for the nine months ended May 31, 2011 and 2010 was $7.4 million and $11.3 million, respectively.