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Goodwill and Purchased Intangible Assets - Schedule of Goodwill (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) reporting_unit | Jun. 30, 2016 USD ($) | Jun. 30, 2014 USD ($)
Goodwill |  |  |  |  |
Number of reporting units | reporting_unit |  | 4 |  |  |
Goodwill |  |  |  |  |
Goodwill, beginning balance |  | $ 335,177 | $ 335,263 |  |
Goodwill reallocation |  |  | 0 |  |
Acquired goodwill |  | 14,280 |  |  |
Foreign currency adjustment |  | 69 | (86) |  |
Goodwill, ending balance |  | 349,526 | 335,177 |  |
Accumulated impairment loss |  |  |  |  | $ 277,600
Wafer Inspection |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill, beginning balance |  | 281,026 | 332,783 | [1] |
Goodwill reallocation | [2] |  | (51,671) |  |
Acquired goodwill |  | 0 |  |  |
Foreign currency adjustment |  | 69 | (86) |  |
Goodwill, ending balance |  | 281,095 | 281,026 |  |
Patterning |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill, beginning balance |  | 53,255 | 2,480 | [3] |
Goodwill reallocation | [2] |  | 50,775 |  |
Acquired goodwill |  | 0 |  |  |
Foreign currency adjustment |  | 0 | 0 |  |
Goodwill, ending balance |  | 53,255 | 53,255 |  |
GSS |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill, beginning balance |  | 0 | 0 |  |
Goodwill reallocation |  |  | 0 |  |
Acquired goodwill |  | 2,856 |  |  |
Foreign currency adjustment |  | 0 | 0 |  |
Goodwill, ending balance |  | 2,856 | 0 |  |
Others |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill, beginning balance |  | 896 | 0 |  |
Goodwill reallocation | [2] |  | 896 |  |
Acquired goodwill |  | 11,424 |  |  |
Foreign currency adjustment |  | 0 | 0 |  |
Goodwill, ending balance |  | $ 12,320 | $ 896 |  |
[1] | The balance as of June 30, 2015, reflects goodwill for the Defect Inspection reporting unit under the old reporting structure which was renamed as Wafer Inspection under a new reporting structure after certain components were allocated out.
[2] | The Company made certain organizational changes and consolidated its product division effective in the first quarter of fiscal 2016. The reorganization resulted in the reallocation of certain goodwill balances as noted above.
[3] | The balance as of June 30, 2015, reflects goodwill for the Metrology reporting unit under the old reporting structure which was renamed as Patterning under a new reporting structure after certain components were allocated in.

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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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