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Revenue - Reconciliation of Deferred Revenue Balances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reconciliation of Deferred Revenue
Deferred revenue - beginning balance	$ 5.2	$ 32.7
Revenue recognized	(4.8)	(6.7)
Prepayments	0.3	5.1
Deferred revenue - ending balance	$ 0.7	$ 31.1

X

- Definition

Contract With Customer, Liability, Including New Contract, Revenue Recognized

+ References

No definition available.

+ Details

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X

- Definition

Contract with customer, liability, prepayments.

+ References

No definition available.

+ Details

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Namespace Prefix:	mygn_
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X

- References

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

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