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Goodwill and Intangible Assets, net (Tables)
9 Months Ended
Jun. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]  
Summary of Changes in Company's Goodwill

A summary of changes in Company’s goodwill is as follows (in thousands):

 

Balance as of September 30, 2020

 

$

240,327

 

Fiscal year 2021 business combinations

 

 

12,971

 

Balance as of June 30, 2021

 

$

253,298

 

Intangible Assets Subject to Amortization

The gross carrying amount and accumulated amortization of intangible assets subject to amortization are as follows (in thousands):

 

 

 

June 30, 2021

 

 

September 30, 2020

 

 

 

Gross

 

 

 

 

 

 

 

 

 

 

Gross

 

 

 

 

 

 

 

 

 

 

 

Carrying

 

 

Accum.

 

 

 

 

 

 

Carrying

 

 

Accum.

 

 

 

 

 

 

 

Amount

 

 

Amortization

 

 

Net

 

 

Amount

 

 

Amortization

 

 

Net

 

Customer lists

 

$

403,913

 

 

$

325,079

 

 

$

78,834

 

 

$

382,942

 

 

$

312,928

 

 

$

70,014

 

Trade names and other intangibles

 

 

40,548

 

 

 

18,948

 

 

 

21,600

 

 

 

37,382

 

 

 

17,103

 

 

 

20,279

 

Total

 

$

444,461

 

 

$

344,027

 

 

$

100,434

 

 

$

420,324

 

 

$

330,031

 

 

$

90,293