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Senior Debt - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2019
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Line Of Credit Facility [Line Items] |  |  |  |
Credit facility principal payments 2020 |  |  | $ 0.6 |
Credit facility principal payments 2021 |  |  | 3.1 |
Credit facility principal payments 2022 |  |  | 3.7 |
Credit facility principal payments 2023 |  |  | 4.4 |
Credit facility principal payments 2024 |  |  | $ 66.1 |
Weighted average interest rate on outstanding borrowings |  |  | 2.31% | 3.80%
Maximum consolidated leverage ratio |  |  | 3.75% |
Scenario Forecast [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Maximum consolidated leverage ratio | 3.25% | 3.50% |  |
Credit Agreement [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Unused credit availability under credit facility |  |  | $ 75.8 | $ 82.3
Letters of Credit [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  | 6.9 | $ 11.0
Bank Guarantees [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Bank guarantee issuance under bilateral lines and collateral |  |  | 50.0 |
Bank guarantee agreement outstanding amount |  |  | 18.0 |
Netherlands Facility [Member] | Euro-Denominated Bank Guarantee [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Bank guarantee agreement outstanding amount |  |  | $ 3.1 |

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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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