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Organization and Summary of Significant Accounting Policies - Schedule of Company's Revenue by Type (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | [1] | Mar. 31, 2018 | [1] | Dec. 31, 2017 | [1] | Sep. 30, 2017 | [1] | Jun. 30, 2019 | Jun. 30, 2018 | [2] | Jun. 30, 2017 | [2]
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 215.4 | $ 216.6 | $ 216.8 | $ 202.3 | $ 193.9 | $ 183.1 | $ 187.9 | $ 178.8 | $ 851.1 | $ 743.7 | [1] | $ 728.7 | [1]
Molecular Diagnostic - Hereditary Cancer Testing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 479.7 | 471.4 |  | 525.5 |
Molecular Diagnostic - GeneSight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 112.6 | 124.9 |  | 78.4 |
Molecular Diagnostic - Prenatal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 104.9 |  |  |  |
Molecular Diagnostic- Vectra [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 48.3 | 55.2 |  | 45.2 |
Molecular Diagnostic - Prolaris [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 25.5 | 21.5 |  | 11.1 |
Molecular Diagnostic - EndoPredict [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 10.4 | 8.8 |  | 7.7 |
Molecular Diagnostic - Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 8.0 | 8.6 |  | 11.5 |
Molecular Diagnostic Testing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | 196.9 | 200.5 | 203.0 | 189.0 | 180.6 | 169.3 | 173.1 | 167.4 | 789.4 | 690.4 | [1] | 679.4 | [1]
Pharmaceutical and Clinical Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 18.5 | $ 16.1 | $ 13.8 | $ 13.3 | $ 13.3 | $ 13.8 | $ 14.8 | $ 11.4 | $ 61.7 | $ 53.3 | [1] | $ 49.3 | [1]
[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 of this report for additional information.
[2] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606)

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