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Segment and Related Information - Reconciliation of Assets by Operating Segment and Geographic Region to Total Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets |  | $ 1,174.1 | $ 1,208.9
Operating segments and geographic region [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets |  | 962.8 | 1,009.7
Cash, cash equivalents, and marketable investment securities [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | [1] | $ 211.3 | $ 199.2
[1] | The Company manages cash, cash equivalents, and marketable investment securities at the consolidated level for all segments

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