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Acquisitions and Investment - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2019 | Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Nov. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity interest acquired |  |  |  | 93.80% | 93.80% |  | 93.80%
Aggregate cost of equity method investments |  |  |  |  |  |  | $ 51,500,000
Working capital adjustment relating to acquisition |  |  |  | $ 200,000 |  |  |
Pro-rata share of earnings from equity method investment |  |  |  |  | $ 2,607,000 | $ 654,000 |
Voting interest |  |  |  |  | 25.00% |  |
Investments |  | $ 11,727,000 |  | 68,222,000 | $ 68,222,000 |  |
Purchase price description of minority interest under equity method |  |  |  |  | The purchase price is equal to the greater of: (a) (i) the product of the aggregate trailing 12-month revenues of the investment preceding the date of purchase, multiplied by (ii) a factor of 2.9 multiplied by (iii) a factor of 0.723, multiplied by (iv) the percentage interest owned by each minority equity holder and (b) $966,666 |  |
Minimum purchase price consideration of remaining minority interest under equity method |  |  |  | 966,666 | $ 966,666 |  |
Purchase price adjustment |  |  |  | (500,000) |  |  |
Goodwill |  | 250,342,000 |  | 274,516,000 | 274,516,000 |  |
II-VI Laser Solutions Segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | 84,180,000 |  | 105,613,000 | 105,613,000 |  |
II-VI Photonics Segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | 113,272,000 |  | 116,013,000 | 116,013,000 |  |
Other Long-term Liabilities | ASC 815-10, Derivatives and Hedging |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity method Investment, noncurrent liabilities |  |  |  |  |  |  | $ 2,200,000
Equity Investment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Investments |  |  |  | 55,800,000 | 55,800,000 |  |
Privately-held Company |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Pro-rata share of earnings from equity method investment |  |  |  | 800,000 | 2,000,000 |  |
II-VI Compound Semiconductor Ltd (Kaiam Laser Limited, Inc) |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net cash paid at acquisition | $ 79,500,000 |  |  |  |  |  |
Goodwill | 19,198,000 |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  | 600,000 | 600,000 |  |
Business acquisition, revenue of acquired entity |  |  |  | 900,000 | 2,500,000 |  |
Business acquisition, (losses) earnings of acquired entity |  |  |  | (4,500,000) | (10,700,000) |  |
II-VI Compound Semiconductor Ltd (Kaiam Laser Limited, Inc) | II-VI Laser Solutions Segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 19,200,000 |  |  |  |  |  |
Integrated Photonics, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net cash paid at acquisition |  | 40,098,000 |  |  |  |  |
Working capital adjustment relating to acquisition |  | 848,000 |  |  |  |  |
Goodwill |  | 17,514,000 |  |  |  |  |
Business acquisition, transaction costs |  | 300,000 |  |  |  |  |
Business acquisition, revenue of acquired entity |  |  |  | 4,900,000 | 15,200,000 |  |
Business acquisition, (losses) earnings of acquired entity |  |  |  | $ 1,100,000 | $ 2,500,000 |  |
Payment of final amount for working capital adjustment |  | 800,000 |  |  |  |  |
Fair value of accounts receivable acquired |  | 2,100,000 |  |  |  |  |
Fair value of accounts receivable gross contractual amount |  | 2,100,000 |  |  |  |  |
Integrated Photonics, Inc | II-VI Photonics Segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | 17,500,000 |  |  |  |  |
Scenario Forecast | CoAdna, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net cash paid at acquisition |  |  | $ 85,000,000 |  |  |  |
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 |  | 2,500,000 |  |  |  |  |
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 |  | $ 2,500,000 |  |  |  |  |

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