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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