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Employee Deferred Savings Plan (Tables)

3 Months Ended

Sep. 30, 2019

Postemployment Benefits [Abstract]

Company Recorded Contributions To Plan

The Company recorded contributions to the plan as follows:

		Three months ended
		September 30,
		2019				2018
Deferred savings plan contributions		$	2.5			$	2.0

X

- Definition

Schedule of recorded contributions by employer to employee deferred savings plan.

+ References

No definition available.

+ Details

Name:	mygn_ScheduleOfRecordedContributionsByEmployerToEmployeeDeferredSavingsPlanTableTextBlock
Namespace Prefix:	mygn_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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