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Basis of Presentation - Adoption of New Revenue Recognition Standard Revenue Impacted Previously Reported (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |
Total revenue | $ 216.8 |  | $ 187.9 | [1] | $ 419.1 | $ 366.7 | [1] |  |
Selling, general, and administrative expense | 135.2 |  | 107.4 | [1] | 265.1 | 214.6 | [1] |  |
Income tax provision | 1.0 |  | (25.3) | [1] | 2.6 | (20.8) | [1] |  |
Net income attributable to Myriad Genetics, Inc. stockholders | $ 2.6 | $ (0.7) | $ 30.9 | [1] | $ 1.9 | $ 109.7 | [1] |  |
Earnings per share: |  |  |  |  |  |  |  |  |
Basic | $ 0.04 |  | $ 0.45 | [1] | $ 0.03 | $ 1.59 | [1] |  |
Diluted | $ 0.03 |  | $ 0.43 | [1] | $ 0.02 | $ 1.54 | [1] |  |
Consolidated Statements of Cash Flows: |  |  |  |  |  |  |  |  |
Net income attributable to Myriad Genetics, Inc. stockholders | $ 2.6 | $ (0.7) | $ 30.9 | [1] | $ 1.9 | $ 109.7 | [1] |  |
Trade accounts receivable |  |  |  |  | (0.9) | (13.0) | [1] |  |
Consolidated Balance Sheet: |  |  |  |  |  |  |  |  |
Trade accounts receivable | 116.6 |  |  |  | 116.6 |  |  | $ 99.5 | [1]
Retained earnings | $ 22.9 |  |  |  | $ 22.9 |  |  | 54.1 | [1]
ASC 606 | As Previously Reported |  |  |  |  |  |  |  |  |
Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |
Total revenue |  |  | 192.7 |  |  | 380.6 |  |  |
Selling, general, and administrative expense |  |  | 115.2 |  |  | 230.4 |  |  |
Income tax provision |  |  | (26.2) |  |  | (21.4) |  |  |
Net income attributable to Myriad Genetics, Inc. stockholders |  |  | $ 28.8 |  |  | $ 108.4 |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |
Basic |  |  | $ 0.42 |  |  | $ 1.57 |  |  |
Diluted |  |  | $ 0.40 |  |  | $ 1.52 |  |  |
Consolidated Statements of Cash Flows: |  |  |  |  |  |  |  |  |
Net income attributable to Myriad Genetics, Inc. stockholders |  |  | $ 28.8 |  |  | $ 108.4 |  |  |
Trade accounts receivable |  |  |  |  |  | (32.5) |  |  |
Consolidated Balance Sheet: |  |  |  |  |  |  |  |  |
Trade accounts receivable |  |  |  |  |  |  |  | 98.3 |
Retained earnings |  |  |  |  |  |  |  | 52.9 |
ASC 606 | Adjustments |  |  |  |  |  |  |  |  |
Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |
Total revenue |  |  | (4.8) |  |  | (13.9) |  |  |
Selling, general, and administrative expense |  |  | (7.8) |  |  | (15.8) |  |  |
Income tax provision |  |  | 0.9 |  |  | 0.6 |  |  |
Net income attributable to Myriad Genetics, Inc. stockholders |  |  | $ 2.1 |  |  | $ 1.3 |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |
Basic |  |  | $ 0.03 |  |  | $ 0.02 |  |  |
Diluted |  |  | $ 0.03 |  |  | $ 0.02 |  |  |
Consolidated Statements of Cash Flows: |  |  |  |  |  |  |  |  |
Net income attributable to Myriad Genetics, Inc. stockholders |  |  | $ 2.1 |  |  | $ 1.3 |  |  |
Trade accounts receivable |  |  |  |  |  | $ (19.5) |  |  |
Consolidated Balance Sheet: |  |  |  |  |  |  |  |  |
Trade accounts receivable |  |  |  |  |  |  |  | 1.2 |
Retained earnings |  |  |  |  |  |  |  | $ 1.2 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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