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Goodwill and Intangible Assets
3 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Note 4 — Goodwill and Intangible Assets

The Partnership’s goodwill and intangible assets comprise the following:
 
 
December 31,
2017
 
September 30,
2017
 
December 31,
2016
Goodwill (not subject to amortization)
 
$
2,002,010

 
$
2,002,010

 
$
1,979,146

Intangible assets:
 
 
 
 
 
 
Customer relationships and noncompete agreements
 
$
496,905

 
$
497,385

 
$
520,480

Accumulated amortization
 
(199,416
)
 
(190,289
)
 
(201,236
)
Intangible assets, net (definite-lived)
 
297,489

 
307,096

 
319,244

Trademarks and tradenames (indefinite-lived)
 
82,944

 
82,944

 
82,944

Total intangible assets, net
 
$
380,433

 
$
390,040

 
$
402,188



Amortization expense of intangible assets was $9,607 and $9,431 for the three months ended December 31, 2017 and 2016, respectively. No amortization expense is included in cost of sales on the Condensed Consolidated Statements of Operations. The estimated aggregate amortization expense of intangible assets for the remainder of Fiscal 2018 and the next four fiscal years is as follows: remainder of Fiscal 2018$28,642; Fiscal 2019$37,024; Fiscal 2020$35,803; Fiscal 2021$33,968; Fiscal 2022$32,361.