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Segment and Related Information - Schedule Of Comparison Of Balance Sheet Assets By Operating Segment (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Net equipment, leasehold improvements and property | $ 43.2 | $ 51.1
Total assets | 1,174.1 | 1,208.9
Diagnostics [Member] |  |
Segment Reporting Information [Line Items] |  |
Net equipment, leasehold improvements and property | 12.2 | 20.2
Total assets | 840.3 | 885.4
Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Net equipment, leasehold improvements and property | 31.0 | 30.9
Total assets | 122.5 | 124.3
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 962.8 | $ 1,009.7

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