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Segment and Related Information (Tables) | 3 Months Ended
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Sep. 30, 2018
Segment Reporting [Abstract] |
Schedule of Segment Performance Based on Income (Loss) before Interest Income and Other Income and Expense | Segment revenue and operating income (loss) were as follows during the periods presented:
|  | Diagnostics |  |  | Other |  |  | Total |
Three months ended September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 189.0 |  |  | $ | 13.3 |  |  | $ | 202.3 |
Depreciation and amortization |  |  | 17.0 |  |  |  | 1.3 |  |  |  | 18.3 |
Segment operating income (loss) |  |  | 27.6 |  |  |  | (26.4 | ) |  |  | 1.2 |
Three months ended September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 167.4 |  |  | $ | 11.4 |  |  | $ | 178.8 |
Depreciation and amortization |  |  | 11.8 |  |  |  | 1.4 |  |  |  | 13.2 |
Segment operating income |  |  | 30.6 |  |  |  | 53.4 |  |  |  | 84.0 |
|  | Three months ended |
|  | September 30, |
|  | 2018 |  |  | 2017 |
Total operating income for reportable segments |  | $ | 1.2 |  |  | $ | 84.0 |
Unallocated amounts: |  |  |  |  |  |  |  |
Interest income |  |  | 0.7 |  |  |  | 0.4 |
Interest expense |  |  | (2.2 | ) |  |  | (0.9 | )
Other |  |  | 1.1 |  |  |  | (0.3 | )
Income from operations before income taxes |  |  | 0.8 |  |  |  | 83.2 |
Income tax provision |  |  | 1.6 |  |  |  | 4.5 |
Net income (loss) |  |  | (0.8 | ) |  |  | 78.7 |
Net loss attributable to non-controlling interest |  |  | (0.1 | ) |  |  | (0.1 | )
Net income (loss) attributable to Myriad Genetics, Inc. stockholders |  | $ | (0.7 | ) |  | $ | 78.8 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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