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Revenue - Composition of Total Revenue by Product and by U.S versus Rest of World (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 195.1 | $ 216.8 | $ 381.4 | $ 419.1
U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 182.3 | 205.8 | 357.0 | 397.5
RoW [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 12.9 | 11.0 | 24.5 | 21.6
Molecular Diagnostic - Hereditary Cancer Testing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 117.7 | 126.7 | 222.2 | 243.1
Molecular Diagnostic - Hereditary Cancer Testing [Member] | U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 112.9 | 123.4 | 213.5 | 237.0
Molecular Diagnostic - Hereditary Cancer Testing [Member] | RoW [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 4.8 | 3.3 | 8.7 | 6.1
Molecular Diagnostic - GeneSight [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 22.5 | 24.0 | 45.2 | 53.2
Molecular Diagnostic - GeneSight [Member] | U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 22.5 | 24.0 | 45.2 | 53.2
Molecular Diagnostic - Prenatal [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 16.4 | 31.2 | 39.9 | 49.3
Molecular Diagnostic - Prenatal [Member] | U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 16.3 | 31.2 | 39.8 | 49.3
Molecular Diagnostic - Prenatal [Member] | RoW [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 0.1 |  | 0.1 |
Molecular Diagnostic - Vectra [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 10.3 | 11.8 | 21.4 | 24.8
Molecular Diagnostic - Vectra [Member] | U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 10.3 | 11.8 | 21.4 | 24.8
Molecular Diagnostic - Prolaris [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 6.8 | 6.1 | 13.3 | 12.3
Molecular Diagnostic - Prolaris [Member] | U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 6.7 | 6.1 | 13.2 | 12.3
Molecular Diagnostic - Prolaris [Member] | RoW [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 0.1 |  | 0.1 |
Molecular Diagnostic - EndoPredict [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2.6 | 2.2 | 4.8 | 4.6
Molecular Diagnostic - EndoPredict [Member] | U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 0.5 | 0.4 | 0.9 | 0.7
Molecular Diagnostic - EndoPredict [Member] | RoW [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2.1 | 1.8 | 3.9 | 3.9
Molecular Diagnostic - Other [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 4.8 | 1.0 | 6.3 | 4.7
Molecular Diagnostic - Other [Member] | U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 4.8 | 0.7 | 6.2 | 4.4
Molecular Diagnostic - Other [Member] | RoW [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue |  | 0.3 | 0.1 | 0.3
Molecular Diagnostic Testing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 181.1 | 203.0 | 353.1 | 392.0
Molecular Diagnostic Testing [Member] | U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 174.0 | 197.6 | 340.2 | 381.7
Molecular Diagnostic Testing [Member] | RoW [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 7.1 | 5.4 | 12.9 | 10.3
Pharmaceutical and Clinical Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 14.0 | 13.8 | 28.3 | 27.1
Pharmaceutical and Clinical Services [Member] | U.S. [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 8.3 | 8.2 | 16.8 | 15.8
Pharmaceutical and Clinical Services [Member] | RoW [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 5.8 | $ 5.6 | $ 11.6 | $ 11.3

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