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Summary of Significant Accounting Policies - Advertising and Marketing Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Advertising and Marketing Costs |  |  |
Advertising costs | $ 37.5 | $ 36.8 | $ 31.2

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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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Period Type: | duration

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- References No definition available. + Details
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