v3.25.4

Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jan. 31, 2026
Stockholders Equity Note [Line Items]
Common stock shares purchased under publicly-announced share repurchase program	1,451,019	986,555	1,204,328
Common stock purchased under publicly-announced share repurchase program, value	$ 274.5	$ 241.6	$ 166.0
Excise tax on stock repurchases	1.00%
Excise tax paid on net stock repurchases	$ 1.6
Subsequent Event
Stockholders Equity Note [Line Items]
Stock repurchase program, authorized amount				$ 100.0

Effective income tax rate reconciliation nondeductible excise tax on stock repurchases.

+ References

No definition available.

+ Details

Name:	manh_EffectiveIncomeTaxRateReconciliationNondeductibleExciseTaxOnStockRepurchases
Namespace Prefix:	manh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Excise tax paid on net stock repurchases.

+ References

No definition available.

+ Details

Name:	manh_ExciseTaxPaidOnNetStockRepurchases
Namespace Prefix:	manh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of shares that have been repurchased under publicly announced program during the period

+ References

No definition available.

+ Details

Name:	manh_StockRepurchasedUnderPubliclyAnnouncedShareRepurchaseProgramDuringPeriodShares
Namespace Prefix:	manh_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the value of stock that have been purchased during the period under publicly announced share repurchase program

+ References

No definition available.

+ Details

Name:	manh_StockRepurchasedUnderPubliclyAnnouncedShareRepurchaseProgramDuringPeriodValue
Namespace Prefix:	manh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Stockholders equity note .

+ References

No definition available.

+ Details

Name:	manh_StockholdersEquityNoteLineItems
Namespace Prefix:	manh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

+ Details

Name:	srt_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

MANHATTAN ASSOCIATES INC 10-K