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Organization and Summary of Significant Accounting Policies - Preliminarily Estimates Impact to Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue	$ 200.9	$ 191.1	$ 192.7	$ 187.9	$ 199.6	$ 194.7	$ 196.7	$ 178.9	$ 772.6	$ 769.9	$ 740.5	$ 722.5
Selling, general, and administrative expense	121.4	115.1	115.4	115.2	122.1	122.1	120.3	111.9	467.1	476.4	359.2	366.0
Income tax provision	3.0	4.5	(26.3)	4.8	5.8	3.0	6.2	5.6	(14.0)	20.6	38.8	54.5
Net income attributable to Myriad Genetics, Inc. stockholders	$ 13.1	$ 9.7	$ 28.7	$ 79.6	$ 12.3	$ 2.8	$ 6.1	$ (0.7)	$ 131.1	$ 20.5	$ 117.2	$ 79.8
Earnings per share:
Basic	$ 0.19	$ 0.14	$ 0.41	$ 1.16	$ 0.18	$ 0.04	$ 0.09	$ (0.01)	$ 1.89	$ 0.30	$ 1.67	$ 1.12
Diluted	$ 0.18	$ 0.13	$ 0.40	$ 1.13	$ 0.18	$ 0.04	$ 0.09	$ (0.01)	$ 1.82	$ 0.30	$ 1.60	$ 1.07
Adjusted for ASC 606 | ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue									$ (28.9)	$ (41.2)
Selling, general, and administrative expense									(32.1)	(36.5)
Income tax provision									1.0	(1.6)
Net income attributable to Myriad Genetics, Inc. stockholders									$ 2.2	$ (3.1)
Earnings per share:
Basic									$ 0.03	$ (0.05)
Diluted									$ 0.03	$ (0.05)
As Adjusted | ASC 606
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Total revenue									$ 743.7	$ 728.7
Selling, general, and administrative expense									435.0	439.9
Income tax provision									(13.0)	19.0
Net income attributable to Myriad Genetics, Inc. stockholders									$ 133.3	$ 17.4
Earnings per share:
Basic									$ 1.92	$ 0.25
Diluted									$ 1.85	$ 0.25

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