This excerpt taken from the OSK 8-K filed Aug 5, 2009.
Goodwill Goodwill reflects the cost of an acquisition in excess of the fair values assigned to identifiable net assets acquired. Goodwill is not amortized; however, it is assessed for impairment at least annually and as triggering events or indicators of potential impairment occur. The Company performs its annual impairment test in the fourth quarter of its fiscal year. The Company evaluates the recoverability of goodwill by estimating the future discounted cash flows of the businesses to which the goodwill relates. Estimated cash flows and related goodwill are grouped at the reporting unit level. A reporting unit is an operating segment or under certain circumstances, a component of an operating segment that constitutes a business. When estimated future discounted cash flows are less than the carrying value of the net assets and related goodwill, an impairment test is performed to measure and recognize the amount of the impairment loss, if any. Impairment losses, limited to the carrying value of goodwill, represent the excess of the carrying amount of a reporting units goodwill over the implied fair value of that goodwill.
In evaluating the recoverability of goodwill, it is necessary to estimate the fair value of the reporting units. The Company evaluates the recoverability of goodwill by estimating the future discounted cash flows of the businesses to which the goodwill relates. In determining the estimated future cash flows, the Company considers current and projected future levels of income as well as business trends, prospects and market and economic conditions. Rates used to discount estimated cash flows correspond to the Companys cost of capital, adjusted for risk where appropriate, and are dependent upon interest rates at a point in time. There are inherent uncertainties related to these factors and managements judgment in applying them to the analysis of goodwill impairment. It is possible that assumptions underlying the impairment analysis will change in such a manner that impairment in value may occur in the future.