Sale Of Stock, Consideration Received On Transaction, Gross

No definition available.

Name:	mdgl_SaleOfStockConsiderationReceivedOnTransactionGross
Namespace Prefix:	mdgl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

+ Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended
	Apr. 02, 2024	Mar. 18, 2024	Apr. 30, 2024	Mar. 31, 2024
Subsequent Event [Line Items]
Cash received on stock transaction after deduction of issuance costs				$ 574.0
Over-Allotment Option
Subsequent Event [Line Items]
Number of shares issued in transaction (in shares)		346,153
Subsequent Event
Subsequent Event [Line Items]
Cash received on stock transaction after deduction of issuance costs			$ 85.9
Subsequent Event \| Over-Allotment Option
Subsequent Event [Line Items]
Number of shares issued in transaction (in shares)	346,153
Shares issued (in USD per share)	$ 260.00
Sale of stock received on transaction, gross	$ 90.0
Cash received on stock transaction after deduction of issuance costs	$ 85.9