Debt instrument maturity month year extended.

No definition available.

Name:	dox_DebtInstrumentMaturityMonthYearExtended
Namespace Prefix:	dox_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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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Balance Type:	debit
Period Type:	instant

- Definition

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

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Balance Type:	debit
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- Definition

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).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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+ Details

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Period Type:	instant

- 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

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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

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-Topic 235
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+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

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-Topic 210
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Average amount outstanding of long-term debt.

+ References

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-Number 229
-Section 1402
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- Definition

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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+ Details

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- Details

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- Details

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- Details

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Financing Arrangements - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended					12 Months Ended
	Dec. 31, 2011	Jul. 31, 2024	Mar. 31, 2021	Jun. 30, 2020	Dec. 31, 2017	Dec. 31, 2014	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Line of Credit Facility [Line Items]
Outstanding letters of credit and bank guarantees							$ 90,837
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		2029-07	2026-03		2022-12	2019-12
Outstanding borrowings							0
Senior Notes [Member]
Line of Credit Facility [Line Items]
Long-term debt				$ 650,000
Debt Instrument, Maturity Date				Jun. 30, 2030
Debt interest rate				2.538%
Debt issue cost				$ 6,121
Interest expense debt							17,098	$ 17,128	$ 17,066
Long term debt fair value							595,621	579,774
Senior Notes [Member] \| Long Term Debt [Member]
Line of Credit Facility [Line Items]
Noncurrent principal outstanding amount							650,000
Senior Notes [Member] \| Accrued Liabilities [Member]
Line of Credit Facility [Line Items]
Accrued interest current							$ 4,822	$ 4,831