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Employee Retirement Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Australia Plan [Member] | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of contribution by the company to the retirement plans | 9.50% |  |
Total contribution by the company to the employee retirement plans | $ 9.5 | $ 10.0 | $ 10.5
United States Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of contribution by the company to the retirement plans | 4.00% |  |
Total contribution by the company to the employee retirement plans | $ 9.3 | 6.7 | 5.0
Singapore Plan [Member] | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of contribution by the company to the retirement plans | 17.00% |  |
Total contribution by the company to the employee retirement plans | $ 2.9 | $ 2.6 | $ 2.2

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- Definition Defined Contribution Plan Maximum Annual Contributions By Employer Percent + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Details
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- Details
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- Details
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- Details
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