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

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

- 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

No definition available.

+ Details

Name:	us-gaap_EquityClassOfTreasuryStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

Name:	us-gaap_PaymentsForRepurchaseOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of excise tax on share purchased 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 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481549/505-30-45-1

+ Details

Name:	us-gaap_ShareRepurchaseProgramExciseTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of excise tax payable on share purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

+ Details

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

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Share Repurchase Program, Number Of Accelerated Repurchase Agreements

+ References

No definition available.

+ Details

Name:	uthr_ShareRepurchaseProgramNumberOfAcceleratedRepurchaseAgreements
Namespace Prefix:	uthr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Stock Repurchase Program, Percentage Of Shares To Be Repurchased

+ References

No definition available.

+ Details

Name:	uthr_StockRepurchaseProgramPercentageOfSharesToBeRepurchased
Namespace Prefix:	uthr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_ShareRepurchaseProgramAxis=uthr_A2026ShareRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=uthr_A2026AcceleratedShareRepurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=uthr_A2026AcceleratedShareRepurchaseAgreementUncollaredAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=uthr_A2026AcceleratedShareRepurchaseAgreementCollaredAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=uthr_A2025ShareRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=uthr_A2025AcceleratedShareRepurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=uthr_A2025AcceleratedShareRepurchaseAgreementUncollaredAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=uthr_A2025AcceleratedShareRepurchaseAgreementCollaredAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders’ Equity - Narrative (Details)					1 Months Ended		3 Months Ended		6 Months Ended
Stockholders’ Equity - Narrative (Details)	Mar. 30, 2026 shares	Mar. 11, 2026 USD ($) shares	Aug. 25, 2025 shares	Aug. 04, 2025 USD ($) shares	Jan. 31, 2026 shares	Nov. 30, 2025 shares	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Jan. 31, 2026 USD ($) shares	Mar. 09, 2026 USD ($) agreement	Aug. 01, 2025 USD ($) agreement	Jul. 31, 2025 USD ($)
Equity, Class of Treasury Stock [Line Items]
Payments to repurchase common stock							$ 1,500,000,000	$ 0
Share repurchase program, excise tax							8,400,000
2026 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount							2,000,000,000.0
2026 Accelerated Share Repurchase Agreements
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount										$ 1,500,000,000
Number of accelerated share repurchase agreements \| agreement										2
Payments to repurchase common stock		$ 1,500,000,000
Share repurchase program, excise tax, payable							$ 8,400,000
2026 Accelerated Share Repurchase Agreement - Uncollared Agreement
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount										$ 750,000,000
Stock repurchased during period, shares (in shares) \| shares		992,120
Stock repurchase program, percentage of shares to be repurchased		70.00%
2026 Accelerated Share Repurchase Agreement - Collared Agreement
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount										$ 750,000,000
Stock repurchased during period, shares (in shares) \| shares	463,682	708,657
Stock repurchase program, percentage of shares to be repurchased		50.00%
2025 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount												$ 1,000,000,000.0
2025 Accelerated Share Repurchase Agreements
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount											$ 1,000,000,000.0
Number of accelerated share repurchase agreements \| agreement											2
Payments to repurchase common stock				$ 1,000,000,000.0
Stock repurchased during period, shares (in shares) \| shares									2,642,498
Share repurchase program, excise tax									$ 1,800,000
2025 Accelerated Share Repurchase Agreement - Uncollared Agreement
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount											$ 500,000,000
Stock repurchased during period, shares (in shares) \| shares				1,274,296		3,882
Stock repurchase program, percentage of shares to be repurchased				75.00%
2025 Accelerated Share Repurchase Agreement - Collared Agreement
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount											$ 500,000,000
Stock repurchased during period, shares (in shares) \| shares			514,789	849,531	0
Stock repurchase program, percentage of shares to be repurchased				50.00%