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Financing Arrangements - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended				12 Months Ended
	Dec. 31, 2011	May 31, 2021	Mar. 31, 2021	Dec. 31, 2017	Dec. 31, 2014	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2020
Line of Credit Facility [Line Items]
Outstanding letters of credit and bank guarantees						$ 64,466
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Five-year revolving credit facility	$ 500,000
Revolving credit facility, maturity term	5 years
Revolving credit facility, maturity period			2026-03	2022-12	2019-12
Repayments of short term loans		$ 100,000
Outstanding borrowings						0
Senior Notes [Member]
Line of Credit Facility [Line Items]
Long-term debt									$ 650,000
Debt interest rate									2.538%
Debt issue cost									$ 6,121
Interest expense debt						17,066	$ 17,052	$ 17,034
Long term debt fair value						521,164	516,620
Senior Notes [Member] | Accrued Liabilities [Member]
Line of Credit Facility [Line Items]
Accrued interest current						4,795	$ 4,805
Senior Notes [Member] | Long-Term Debt [Member]
Line of Credit Facility [Line Items]
Non-current outstanding principal portion						$ 650,000

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Debt instrument maturity month year extended.

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Noncurrent outstanding principal portion.

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Repayments of short term loans.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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.

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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.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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