Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss) attributable to Myriad Genetics, Inc. stockholders	$ (144.1)	$ 8.8
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	54.3	54.6
Non-cash interest expense	0.3	0.3
Gain on deconsolidation of subsidiary	(1.0)
Gain on disposition of assets	(0.2)	(0.9)
Share-based compensation expense	23.3	24.7
Deferred income taxes	(22.9)	3.0
Unrecognized tax benefits	0.6	(7.3)
Impairment of goodwill and intangible assets	99.7
Change in fair value of contingent consideration	2.8	(1.4)
Payment of contingent consideration		(1.5)
Changes in assets and liabilities:
Prepaid expenses	3.5	2.0
Trade accounts receivable	29.5	(27.0)
Other receivables	0.9	(0.4)
Inventory		7.4
Prepaid taxes	(0.3)	(3.0)
Accounts payable	(2.1)	(8.1)
Accrued liabilities	(15.4)	1.4
Deferred revenue	1.8	(0.4)
Net cash provided by operating activities	30.7	52.2
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(7.8)	(7.2)
Acquisitions, net of cash acquired		(278.5)
Proceeds from sale of subsidiary	21.3
Purchases of marketable investment securities	(60.8)	(57.0)
Proceeds from maturities and sales of marketable investment securities	56.3	51.8
Net cash provided by (used in) investing activities	9.0	(290.9)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from common stock issued under share-based compensation plans	1.5	6.5
Payment of contingent consideration recognized at acquisition	(3.9)
Net proceeds from revolving credit facility		340.0
Repayment of revolving credit facility	(8.6)	(85.0)
Fees associated with refinancing of revolving credit facility		(1.4)
Repurchase and retirement of common stock		(50.0)
Net cash provided by (used in) financing activities	(11.0)	210.1
Effect of foreign exchange rates on cash and cash equivalents	(0.9)	2.6
Net increase (decrease) in cash and cash equivalents	27.8	(26.0)
Cash and cash equivalents at beginning of the period	93.2	110.9
Cash and cash equivalents at end of the period	$ 121.0	$ 84.9

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Period Type:	duration

- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration