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Revenue - Reconciliation of Deferred Revenue Balances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of Deferred Revenue
Deferred revenue - beginning balance	$ 32.7	$ 3.6
Revenue recognized	(6.7)	(1.3)
Prepayments	5.1	1.5
Deferred revenue - ending balance	$ 31.1	$ 3.8

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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- 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=121556615&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

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=121604090&loc=SL49130549-203045

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