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Acquisitions - Pro Forma Results of Acquisitions (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Business Combinations [Abstract] |  |
Revenue | $ 190.2 | $ 188.9
Income from operations | 87.4 | (0.8)
Net income (loss) | $ 81.1 | $ (19.2)
Net income (loss) per share, basic | $ 1.18 | $ (0.28)
Net income (loss) per share, diluted | $ 1.15 | $ (0.28)

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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