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Goodwill and Other Intangible Assets - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 459,972	$ 451,716
Accum. Amortization	383,666	367,206
Net	76,306	84,510
Customer Lists
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	418,190	409,980
Accum. Amortization	358,855	345,237
Net	59,335	64,743
Trade Names And Other Intangibles
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	41,782	41,736
Accum. Amortization	24,811	21,969
Net	$ 16,971	$ 19,767

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 928
-SubTopic 340
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
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-Name Accounting Standards Codification
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