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Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 09, 2017 | Jun. 30, 2016
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Purchase Price Allocation |  |  |  |
Goodwill | $ 354,698 | $ 349,526 |  | $ 335,177
Privately-held Design and Manufacturing Company |  |  |  |
Purchase Price Allocation |  |  |  |
Intangible assets |  |  | $ 17,660 |
Goodwill |  |  | 14,379 |
Assets acquired (including cash and marketable securities of $3.2 million) |  |  | 6,110 |
Liabilities assumed |  |  | (1,334) |
Fair value of net assets acquired |  |  | 36,815 |
Cash and marketable securities |  |  | $ 3,200 |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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