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Goodwill and Purchased Intangible Assets - Schedule of Goodwill (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) reporting_unit | Jun. 30, 2017 USD ($)
Goodwill |  |
Number of reporting units | reporting_unit | 4 |
Goodwill |  |
Balance as of June 30, 2017 | $ 349,526 |
Foreign currency and other adjustments | 497 |
Balance as of December 31, 2017 | 350,023 |
Accumulated impairment loss | 277,600 | $ 277,600
Wafer Inspection |  |
Goodwill |  |
Balance as of June 30, 2017 | 281,095 |
Foreign currency and other adjustments | 13 |
Balance as of December 31, 2017 | 281,108 |
Patterning |  |
Goodwill |  |
Balance as of June 30, 2017 | 53,255 |
Foreign currency and other adjustments | 0 |
Balance as of December 31, 2017 | 53,255 |
GSS |  |
Goodwill |  |
Balance as of June 30, 2017 | 2,856 |
Foreign currency and other adjustments | 97 |
Balance as of December 31, 2017 | 2,953 |
Others |  |
Goodwill |  |
Balance as of June 30, 2017 | 12,320 |
Foreign currency and other adjustments | 387 |
Balance as of December 31, 2017 | $ 12,707 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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