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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions | 6 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract] |  |
Cash paid during the period for income taxes | $ 5.5 | $ 8.0
Non-cash investing and financing activities: |  |
Fair value adjustment on marketable investment securities recorded to other stockholder's equity | $ (0.3) | $ (0.8)

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- Definition Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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