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Contingencies, Significant Estimates and Concentrations - Additional Information (Details) - USD ($)	3 Months Ended
	Dec. 31, 2021	Sep. 30, 2021
Personal Injury Actions and Other
Loss Contingencies [Line Items]
Maximum self-insurance available per claim	$ 5,000,000.0
Reserve for loss contingencies	45,100,000	$ 49,500,000
Performance and Specialty Bonds
Loss Contingencies [Line Items]
Commitments and contingencies	1,240,000,000	1,130,000,000
Standby Letters of Credit
Loss Contingencies [Line Items]
Commitments and contingencies	$ 22,100,000	$ 22,300,000

X

- Definition

Represents the maximum self-insurance for future claims per claim held by the entity.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

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Period Type:	instant

X

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248

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- Details

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- Details

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