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Contingencies and Commitments - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Rent expense, net of sublease income |  | $ 57,559 | $ 55,480 | $ 53,164
Subsequent Event [Member] | Long Running Legal Dispute [Member] |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Settlement payments | $ 50,000 |  |  |
Accrued legal fees and other associated costs | $ 5,000 |  |  |

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- Definition Legal Fees And Other Associated Costs + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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