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Revenue - Composition of Total Revenue by Product and U.S versus Rest of World (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | $ 216.6 | $ 183.1 | [1] | $ 635.7 | $ 549.8 | [1]
U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 204.4 | 171.3 |  | 601.9 | 518.0 |
RoW [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 12.2 | 11.8 |  | 33.8 | 31.8 |
Molecular Diagnostic - Hereditary Cancer Testing [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 117.6 | 113.1 |  | 360.7 | 352.2 |
Molecular Diagnostic - Hereditary Cancer Testing [Member] | U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 114.3 | 110.4 |  | 351.4 | 344.5 |
Molecular Diagnostic - Hereditary Cancer Testing [Member] | RoW [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 3.3 | 2.7 |  | 9.3 | 7.7 |
Molecular Diagnostic - GeneSight [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 29.6 | 30.4 |  | 82.8 | 91.0 |
Molecular Diagnostic - GeneSight [Member] | U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 29.6 | 30.4 |  | 82.8 | 91.0 |
Molecular Diagnostic - Prenatal [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 30.6 |  |  | 80.0 |  |
Molecular Diagnostic - Prenatal [Member] | U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 30.6 |  |  | 80.0 |  |
Molecular Diagnostic- Vectra [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 11.3 | 15.0 |  | 36.1 | 40.1 |
Molecular Diagnostic- Vectra [Member] | U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 11.3 | 15.0 |  | 36.1 | 40.1 |
Molecular Diagnostic - Prolaris [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 6.9 | 6.4 |  | 19.2 | 14.4 |
Molecular Diagnostic - Prolaris [Member] | U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 6.9 | 6.3 |  | 19.1 | 14.3 |
Molecular Diagnostic - Prolaris [Member] | RoW [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue |  | 0.1 |  | 0.1 | 0.1 |
Molecular Diagnostic - EndoPredict [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 2.8 | 2.3 |  | 7.4 | 6.1 |
Molecular Diagnostic - EndoPredict [Member] | U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 0.5 | 0.2 |  | 1.2 | 0.3 |
Molecular Diagnostic - EndoPredict [Member] | RoW [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 2.3 | 2.1 |  | 6.2 | 5.8 |
Molecular Diagnostic - Other [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 1.7 | 2.1 |  | 6.3 | 5.9 |
Molecular Diagnostic - Other [Member] | U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 1.5 | 2.0 |  | 5.8 | 5.5 |
Molecular Diagnostic - Other [Member] | RoW [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 0.2 | 0.1 |  | 0.5 | 0.4 |
Molecular Diagnostic Testing [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 200.5 | 169.3 | [1] | 592.5 | 509.7 | [1]
Molecular Diagnostic Testing [Member] | U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 194.7 | 164.3 |  | 576.4 | 495.7 |
Molecular Diagnostic Testing [Member] | RoW [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 5.8 | 5.0 |  | 16.1 | 14.0 |
Pharmaceutical and Clinical Services [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 16.1 | 13.8 | [1] | 43.2 | 40.1 | [1]
Pharmaceutical and Clinical Services [Member] | U.S. [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | 9.7 | 7.0 |  | 25.5 | 22.3 |
Pharmaceutical and Clinical Services [Member] | RoW [Member] |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Total revenue | $ 6.4 | $ 6.8 |  | $ 17.7 | $ 17.8 |
[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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