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Contingencies, Significant Estimates and Concentrations - Additional Information (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019
Personal Injury Actions and Other |  |
Loss Contingencies [Line Items] |  |
Maximum self-insurance available per claim | $ 5,000,000.0 |
Reserve for loss contingencies | 34,600,000 | $ 36,200,000
Performance and Specialty Bonds |  |
Loss Contingencies [Line Items] |  |
Commitments and contingencies | 631,700,000 | 552,200,000
Standby Letters of Credit |  |
Loss Contingencies [Line Items] |  |
Commitments and contingencies | $ 63,500,000 | $ 63,700,000

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- Definition Represents the maximum self-insurance for future claims per claim held by the entity. + References No definition available. + Details
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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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- 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=118942415&loc=d3e14326-108349 + Details
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- 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=118942415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118942415&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=118943654&loc=d3e12021-110248 + Details
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- Details
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