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Goodwill and Intangible Assets, net - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 451,194	$ 451,716
Accum. Amortization	377,922	367,206
Net	73,272	84,510
Customer Lists
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	409,679	409,980
Accum. Amortization	354,922	345,237
Net	54,757	64,743
Trade Names And Other Intangibles
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	41,515	41,736
Accum. Amortization	23,000	21,969
Net	$ 18,515	$ 19,767

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Name Accounting Standards Codification
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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