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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net cash paid at acquisition |  |  |  | $ 80,503 | $ 40,015 | $ 122,157 |
Purchase price adjustment | $ (500) |  |  |  |  |  |
Goodwill |  | $ 250,342 |  | 270,678 | 250,342 | 233,755 |
II-VI Laser Solutions Segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | 84,180 |  | 103,390 | 84,180 | 84,105 |
II-VI Photonics Segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | 113,272 |  | 114,398 | 113,272 | $ 96,760 |
II-VI Compound Semiconductor Ltd (Kaiam Laser Limited, Inc) |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net cash paid at acquisition | 79,500 |  |  |  |  |  |
Goodwill | 18,956 |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  | 600 |  |  |
Business acquisition, revenue of acquired entity |  |  |  | 3,400 |  |  |
Business acquisition, (losses) earnings of acquired entity |  |  |  | (12,500) |  |  |
II-VI Compound Semiconductor Ltd (Kaiam Laser Limited, Inc) | II-VI Laser Solutions Segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 19,000 |  |  |  |  |  |
Integrated Photonics, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net cash paid at acquisition |  | 40,098 |  |  |  |  |
Goodwill |  | 17,514 |  |  | 17,514 |  |
Business acquisition, transaction costs |  | 300 |  |  | 300 |  |
Business acquisition, revenue of acquired entity |  |  |  | 19,300 | 1,300 |  |
Business acquisition, (losses) earnings of acquired entity |  |  |  | $ 3,800 | 100 |  |
Payment of final amount for working capital adjustment |  | 800 |  |  |  |  |
Fair value of accounts receivable acquired |  | 2,100 |  |  | 2,100 |  |
Fair value of accounts receivable gross contractual amount |  | 2,100 |  |  | 2,100 |  |
Integrated Photonics, Inc | II-VI Photonics Segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | 17,500 |  |  | 17,500 |  |
Scenario Forecast | CoAdna, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net cash paid at acquisition |  |  | $ 85,000 |  |  |  |
Business acquisitions, contingent consideration |  |  |  |  |  |  | $ 85,000
Upon Achievement of Financial And Transitional Objectives Relating to Finance Information Technology And Human Resources | Integrated Photonics, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisitions, contingent consideration, current |  | 2,500 |  |  | 2,500 |  |
Upon Achievement of Financial And Transitional Objectives Relating to Finance Information Technology And Human Resources | Integrated Photonics, Inc | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisitions, contingent consideration |  | $ 2,500 |  |  | $ 2,500 |  |

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