Debt - Additional Information (Details) $ in Millions	Sep. 30, 2025 USD ($)
Short Term Debt
Line Of Credit Facility [Line Items]
Lines of credit unused and available	$ 115.3
Line of credit facility advanced under foreign credit line	33.2
Line of Credit Facility Credit Used For Guarantee	0.4
Long Term Debt
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity	0.0
Credit Agreement
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity	225.0
Letter of Credit \| Long Term Debt
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity	100.0
Swing Line Facility \| Long Term Debt
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity	50.0
Incremental Term Loan Facility \| Long Term Debt
Line Of Credit Facility [Line Items]
Long-term debt, aggregate principal amount	350.0
Alternative Currency Sublimit Facility \| Long Term Debt
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity	40.0
Unsecured \| Short Term Debt
Line Of Credit Facility [Line Items]
Lines of credit maximum borrowing capacity	$ 148.9

Line of credit facility advanced under foreign credit line.

No definition available.

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Namespace Prefix:	diod_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently used for import and export guarantee.

+ References

No definition available.

+ Details

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Namespace Prefix:	diod_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

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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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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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+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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-Topic 470
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+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
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- Details

Name:	us-gaap_DebtInstrumentAxis=diod_CreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
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- Details

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- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: