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Marketable Securities - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Marketable Securities |  |  |
Realized gains on available-for-sale securities | $ 0.2 | $ 0.4 | $ 0.9
Corporate and Government Securities |  |  |
Marketable Securities |  |  |
Investment portfolio, maximum maturity term | 3 years |  |

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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