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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