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Share-Based Compensation - Schedule of Share-Based Compensation Recognized in Consolidated Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total share-based compensation expense | $ 7.0 | $ 7.5 | $ 15.8 | $ 15.2
Molecular Diagnostic Testing Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total share-based compensation expense | 0.3 | 0.2 | 0.5 | 0.3
Pharmaceutical and Clinical Services Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total share-based compensation expense | 0.1 | 0.0 | 0.1 | 0.1
Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total share-based compensation expense | 1.2 | 1.1 | 2.7 | 2.3
Selling, General, and Administrative Expenses [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total share-based compensation expense | $ 5.4 | $ 6.2 | $ 12.5 | $ 12.5

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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