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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
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 202.3 | $ 178.8
U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 191.6 | 169.4
RoW [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 10.7 | 9.4
Molecular Diagnostic - Hereditary Cancer Testing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 116.3 | 117.0
Molecular Diagnostic - Hereditary Cancer Testing [Member] | U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 113.5 | 114.6
Molecular Diagnostic - Hereditary Cancer Testing [Member] | RoW [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2.8 | 2.4
Molecular Diagnostic - GeneSight [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 29.3 | 28.8
Molecular Diagnostic - GeneSight [Member] | U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 29.3 | 28.8
Molecular Diagnostic - Prenatal [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 18.1 |
Molecular Diagnostic - Prenatal [Member] | U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 18.1 |
Molecular Diagnostic- VectraDA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 13.0 | 14.0
Molecular Diagnostic- VectraDA [Member] | U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 13.0 | 14.0
Molecular Diagnostic - Prolaris [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 6.2 | 3.9
Molecular Diagnostic - Prolaris [Member] | U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 6.2 | 3.9
Molecular Diagnostic - EndoPredict [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2.4 | 1.8
Molecular Diagnostic - EndoPredict [Member] | U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 0.3 | 0.0
Molecular Diagnostic - EndoPredict [Member] | RoW [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2.1 | 1.8
Molecular Diagnostic - Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 3.7 | 1.9
Molecular Diagnostic - Other [Member] | U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 3.6 | 1.8
Molecular Diagnostic - Other [Member] | RoW [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 0.1 | 0.1
Molecular Diagnostic Testing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 189.0 | 167.4
Molecular Diagnostic Testing [Member] | U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 184.0 | 163.1
Molecular Diagnostic Testing [Member] | RoW [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 5.0 | 4.3
Pharmaceutical and Clinical Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 13.3 | 11.4
Pharmaceutical and Clinical Services [Member] | U.S. [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 7.6 | 6.3
Pharmaceutical and Clinical Services [Member] | RoW [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 5.7 | $ 5.1

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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