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Leases - Summary of Supplemental Information Related to Operating Lease (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Supplemental Information Related to Operating Lease transactions [Line Items]
Lease liability payments	$ 79,028	$ 88,272
Lease assets obtained in exchange for liabilities	$ 14,580	$ 87,820
Weighted average remaining lease term — Operating leases	6 years 4 months 24 days	6 years 9 months 18 days
Weighted average discount rate — Operating leases	3.70%	3.50%

X

- Definition

Disclosure Of Supplemental Cash Flow Information Related To Operating Lease [Line item].

+ References

No definition available.

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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-Publisher FASB
-Name Accounting Standards Codification
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