The following table summarizes the components of gross and net acquired intangible assets:

Other acquired intangible assets include contract-based and technology-based intangible assets.

The Company evaluates long-lived assets, including amortizable and indefinite-lived intangible assets, for impairment whenever events or changes in circumstances indicate the carrying value may not be recoverable. The Company evaluates indefinite-lived intangible assets on an annual basis. In fiscal 2015, the Company recognized a non-cash $7.3 million impairment charge to certain indefinite-lived intangible assets as a result of increased competition in the marketplace and declining volume of sales. The fair value of the remaining $15.0 million of indefinite-lived intangible assets that were impaired exceeded their carrying value at September 26, 2015. Other factors indicating the carrying value of the Company’s amortizable intangible assets may not be recoverable were not present in fiscal 2015 or during the three months ended December 26, 2015, and accordingly, no impairment testing was performed on these assets.

The Company amortizes its acquired intangible assets with definite lives over periods ranging from 1 to 25 years; over weighted average remaining lives of six years for marketing-related intangibles, 14 years for customer-related intangibles and 14 years for other acquired intangibles. Amortization expense for intangibles subject to amortization was approximately $1.0 million and $0.9 million for the three month periods ended December 26, 2015 and December 27, 2014, respectively, and is classified within operating expenses in the condensed consolidated statements of operations. Estimated annual amortization expense related to acquired intangible assets in each of the succeeding five years is estimated to be approximately $4 million per year from fiscal 2016 through fiscal 2020.