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GOODWILL AND INTANGIBLE ASSETS
 6 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS
NOTE 5 GOODWILL AND INTANGIBLE ASSETS
Goodwill
Goodwill represents the excess of the purchase price over the fair values of the assets acquired and liabilities assumed in a business combination, at the date of acquisition. Goodwill is not amortized but is tested for potential impairment at the reporting unit level, at a minimum on an annual basis, or when indications of potential impairment exist. All of our goodwill is within our North America Solutions reportable segment. 
During the three and six months ended March 31, 2022, we had no additions or impairments to goodwill. As of March 31, 2022 and September 30, 2021, the goodwill balance was $45.7 million.
Intangible Assets
Finite-lived intangible assets are amortized using the straight-line method over the period in which these assets contribute to our cash flows and are evaluated for impairment in accordance with our policies for valuation of long-lived assets.  All of our intangible assets are within our North America Solutions reportable segment. Intangible assets consist of the following:
 March 31, 2022September 30, 2021
(in thousands)Weighted Average Estimated Useful LivesGross
Carrying
Amount		Accumulated
Amortization		NetGross
Carrying
Amount		Accumulated
Amortization		Net
Finite-lived intangible asset:      
Developed technology15 years$89,096 $25,160 $63,936 $89,096 $22,182 $66,914 
Intellectual property13 years1,500 272 1,228 1,500 216 1,284 
Trade name20 years5,865 1,316 4,549 5,865 1,158 4,707 
Customer relationships5 years4,000 3,467 533 4,000 3,067 933 
$100,461 $30,215 $70,246 $100,461 $26,623 $73,838 
Amortization expense in the Unaudited Condensed Consolidated Statements of Operations was $1.8 million for both the three months ended March 31, 2022 and 2021, and $3.6 million for both the six months ended March 31, 2022 and 2021. Amortization is estimated to be approximately $3.6 million for the remainder of fiscal year 2022, approximately $6.5 million for fiscal year 2023, and approximately $6.4 million for fiscal years 2024, 2025 and 2026.