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Revisions of Previously-Issued Financial Statements - Summary of Effect of Corrections on Previously Reported Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, shares in Millions, $ 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
Error Corrections And Prior Period Adjustments Restatement [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
Costs and expenses:
Research and development expense	17.7	18.5	16.8	17.8	18.8	17.6	18.6	19.4	70.8	74.4	70.6	75.5
Change in the fair value of contingent consideration	0.2	(1.2)	13.0	(73.2)	(2.7)	5.2	(3.8)	0.5	(61.2)	(0.8)
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
Total costs and expenses	185.0	176.5	189.6	102.8	180.7	189.2	179.5	171.8	653.9	721.2	587.1	588.9
Operating income	15.9	14.6	3.1	85.1	18.9	5.5	17.2	7.1	118.7	48.7	153.4	133.6
Other income (expense):
Interest income	0.5	0.5	0.4	0.4	0.3	0.3	0.3	0.3	1.8	1.2	0.9	0.4
Interest expense	(1.1)	(0.5)	(0.7)	(0.9)	(1.2)	(1.5)	(2.6)	(0.7)	(3.2)	(6.0)	(0.3)	(0.2)
Other	0.8	(0.5)	(0.4)	(0.3)	(0.1)	1.5	(2.6)	(1.8)	(0.4)	(3.0)	2.0	0.5
Total other income (expense):	0.2	(0.5)	(0.7)	(0.8)	(1.0)	0.3	(4.9)	(2.2)	(1.8)	(7.8)	2.6	0.7
Income before income tax	16.1	14.1	2.4	84.3	17.9	5.8	12.3	4.9	116.9	40.9	156.0	134.3
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	13.1	9.6	28.7	79.5	12.1	2.8	6.1	(0.7)	130.9	20.3	117.2	79.8
Net loss attributable to non-controlling interest		(0.1)		(0.1)	(0.2)				(0.2)	(0.2)
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
Weighted average shares outstanding:
Basic	70.1	69.8	69.3	68.6	68.2	68.1	68.2	68.8	69.4	68.3	70.0	71.3
Diluted	72.9	72.4	71.9	70.4	68.9	68.3	68.3	68.8	72.0	68.8	73.4	74.5
As Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total revenue		$ 193.5	$ 194.0	$ 190.2	$ 200.5	$ 196.9	$ 196.5	$ 177.5		$ 771.4	$ 753.8	$ 723.1
Costs and expenses:
Research and development expense		18.5	16.8	17.8	18.8	17.6	18.6	19.4		74.4	70.6	75.5
Change in the fair value of contingent consideration		(1.2)	13.0	(73.2)	(2.7)	5.2	(3.8)	0.5		(0.8)
Selling, general, and administrative expense		115.1	115.4	115.2	122.1	122.1	120.3	111.9		476.4	359.1	366.0
Total costs and expenses		176.5	189.6	102.8	180.7	189.2	179.5	171.8		721.2	587.0	588.9
Operating income		17.0	4.4	87.4	19.8	7.7	17.0	5.7		50.2	166.8	134.2
Other income (expense):
Interest income		0.5	0.4	0.4	0.3	0.3	0.3	0.3		1.2	0.9	0.4
Interest expense		(0.5)	(0.7)	(0.9)	(1.2)	(1.5)	(2.6)	(0.7)		(6.0)	(0.3)	(0.2)
Other		(0.5)	(0.4)	(0.3)	(0.1)	1.5	(2.6)	(1.3)		(2.5)	1.5	0.5
Total other income (expense):		(0.5)	(0.7)	(0.8)	(1.0)	0.3	(4.9)	(1.7)		(7.3)	2.1	0.7
Income before income tax		16.5	3.7	86.6	18.8	8.0	12.1	4.0		42.9	168.9	134.9
Income tax provision		5.2	(28.4)	5.6	6.1	3.8	6.2	5.2		21.3	43.6	54.7
Net income		11.3	32.1	81.0	12.7	4.2	5.9	(1.2)		21.6	125.3	80.2
Net loss attributable to non-controlling interest		(0.1)		(0.1)	(0.2)					(0.2)
Net income attributable to Myriad Genetics, Inc. stockholders		$ 11.4	$ 32.1	$ 81.1	$ 12.9	$ 4.2	$ 5.9	$ (1.2)		$ 21.8	$ 125.3	$ 80.2
Earnings per share:
Basic		$ 0.16	$ 0.46	$ 1.18	$ 0.19	$ 0.06	$ 0.09	$ (0.02)		$ 0.32	$ 1.79	$ 1.12
Diluted		$ 0.16	$ 0.45	$ 1.15	$ 0.19	$ 0.06	$ 0.09	$ (0.02)		$ 0.32	$ 1.71	$ 1.08
Weighted average shares outstanding:
Basic		69.8	69.3	68.6	68.2	68.1	68.2	68.8		68.3	70.0	71.3
Diluted		72.4	71.9	70.4	68.9	68.3	68.3	68.8		68.8	73.4	74.5
Adjustment [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total revenue		$ (2.4)	$ (1.3)	$ (2.3)	$ (0.9)	$ (2.2)	$ 0.2	$ 1.4		$ (1.5)	$ (13.3)	$ (0.6)
Costs and expenses:
Selling, general, and administrative expense											0.1
Total costs and expenses											0.1
Operating income		(2.4)	(1.3)	(2.3)	(0.9)	(2.2)	0.2	1.4		(1.5)	(13.4)	(0.6)
Other income (expense):
Other								(0.5)		(0.5)	0.5
Total other income (expense):								(0.5)		(0.5)	0.5
Income before income tax		(2.4)	(1.3)	(2.3)	(0.9)	(2.2)	0.2	0.9		(2.0)	(12.9)	(0.6)
Income tax provision		(0.7)	2.1	(0.8)	(0.3)	(0.8)		0.4		(0.7)	(4.8)	(0.2)
Net income		(1.7)	(3.4)	(1.5)	(0.6)	(1.4)	0.2	0.5		(1.3)	(8.1)	(0.4)
Net income attributable to Myriad Genetics, Inc. stockholders		$ (1.7)	$ (3.4)	$ (1.5)	$ (0.6)	$ (1.4)	$ 0.2	$ 0.5		$ (1.3)	$ (8.1)	$ (0.4)
Earnings per share:
Basic		$ (0.02)	$ (0.05)	$ (0.02)	$ (0.01)	$ (0.02)	$ 0.00	$ 0.01		$ (0.02)	$ (0.12)	$ (0.01)
Diluted		$ (0.02)	$ (0.05)	$ (0.02)	$ (0.01)	$ (0.02)	$ 0.00	$ 0.01		$ (0.02)	$ (0.11)	$ (0.01)
Weighted average shares outstanding:
Basic		69.8	69.3	68.6	68.2	68.1	68.2	68.8		68.3	70.0	71.3
Diluted		72.4	71.9	70.4	68.9	68.3	68.3	68.8		68.8	73.4	74.5
Molecular Diagnostic Testing [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total revenue	$ 187.6	$ 177.3	$ 177.9	$ 176.5	$ 187.0	$ 183.0	$ 184.1	$ 166.5	$ 719.3	$ 720.6	$ 692.4	$ 694.9
Costs and expenses:
Total costs and expenses	38.0	36.8	37.7	36.2	35.6	37.9	37.4	34.3	148.7	145.2	132.8	132.8
Molecular Diagnostic Testing [Member] | As Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total revenue		179.7	179.2	178.8	187.9	185.2	183.9	165.1		722.1	705.7	695.5
Costs and expenses:
Total costs and expenses		36.8	37.7	36.2	35.6	37.9	37.4	34.3		145.2	132.8	132.8
Molecular Diagnostic Testing [Member] | Adjustment [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total revenue		(2.4)	(1.3)	(2.3)	(0.9)	(2.2)	0.2	1.4		(1.5)	(13.3)	(0.6)
Pharmaceutical and Clinical Services [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total revenue	13.3	13.8	14.8	11.4	12.6	11.7	12.6	12.4	53.3	49.3	48.1	27.6
Costs and expenses:
Total costs and expenses	$ 7.7	7.3	6.7	6.8	6.9	6.4	7.0	5.7	$ 28.5	26.0	24.5	14.6
Pharmaceutical and Clinical Services [Member] | As Reported [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Total revenue		13.8	14.8	11.4	12.6	11.7	12.6	12.4		49.3	48.1	27.6
Costs and expenses:
Total costs and expenses		$ 7.3	$ 6.7	$ 6.8	$ 6.9	$ 6.4	$ 7.0	$ 5.7		$ 26.0	$ 24.5	$ 14.6

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