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Goodwill and Intangible Assets
3 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets
Amortization expense associated with our intangible assets, which has been reflected as a separate operating expense caption within the accompanying condensed consolidated statements of income and comprehensive income, consisted of the following: 
 
Quarter Ended December 31,
 
2017
 
2016
 
(In thousands)
Cost of revenues
$
706

 
$
1,686

Selling, general and administrative expenses
1,082

 
1,634

 
$
1,788

 
$
3,320



Cost of revenues reflects our amortization of completed technology and selling, general and administrative expenses reflects our amortization of other intangible assets. Intangible assets, gross were $112.1 million and $114.5 million as of December 31, 2017 and September 30, 2017, respectively.

Estimated future intangible asset amortization expense associated with intangible assets existing at December 31, 2017 was as follows (in thousands):
Year Ended September 30,
 
2018 (excluding the quarter ended December 31, 2017)
$
4,803

2019
6,085

2020
3,689

2021
2,433

2022
2,287

Thereafter
217


$
19,514


The following table summarizes changes to goodwill during the quarter ended December 31, 2017, both in total and as allocated to our segments:
 
Applications
 
Scores
 
Decision Management Software
 
Total
 
(In thousands)
Balance at September 30, 2017
$
588,288

 
$
146,648

 
$
69,478

 
$
804,414

Foreign currency translation adjustment
1,777

 

 
141

 
1,918

Balance at December 31, 2017
$
590,065

 
$
146,648

 
$
69,619

 
$
806,332