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GOODWILL AND INTANGIBLE ASSETS
 3 Months Ended
Dec. 31, 2020
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 months ended December 31, 2020, we had no additions or impairments to goodwill. As of December 31, 2020 and September 30, 2020, 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 consisted of the following:
 December 31, 2020September 30, 2020
(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 $17,716 $71,380 $89,096 $16,222 $72,874 
Intellectual property13 years1,500 131 1,369 1,500 103 1,397 
Trade name20 years5,865 921 4,944 5,865 842 5,023 
Customer relationships5 years4,000 2,467 1,533 4,000 2,267 1,733 
$100,461 $21,235 $79,226 $100,461 $19,434 $81,027 
Amortization expense in the Unaudited Condensed Consolidated Statements of Operations was $1.8 million and $1.9 million for the three months ended December 31, 2020 and 2019, respectively. Amortization is estimated to be approximately $5.4 million for the remainder of fiscal year 2021, approximately $7.2 million for fiscal year 2022, approximately $6.5 million for fiscal year 2023, and approximately $6.4 million for fiscal years 2024 and 2025.