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Acquisitions - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2018
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2018
Jun. 30, 2018
Business Acquisition [Line Items]          
Goodwill   $ 298,250,000   $ 298,250,000 $ 270,678,000
II-VI Photonics Segment          
Business Acquisition [Line Items]          
Goodwill   134,072,000   134,072,000 $ 109,670,000
CoAdna Holdings, Inc.          
Business Acquisition [Line Items]          
Net cash paid at acquisition     $ 85,000,000    
Acquisition, inclusive of cash acquired     42,200,000    
Goodwill     24,844,000    
Business acquisition, transaction costs   1,900,000   1,900,000  
Fair value of accounts receivable acquired     5,700,000    
Fair value of accounts receivable gross contractual amount     5,700,000    
Goodwill deductible for income tax purposes     0    
Business acquisition, revenue of acquired entity   $ 7,100,000   $ 10,100,000  
Business acquisition, Inventory acquired     6,189,000    
Intangible assets     16,072,000    
CoAdna Holdings, Inc. | II-VI Photonics Segment          
Business Acquisition [Line Items]          
Goodwill     $ 24,800,000    
Product Line          
Business Acquisition [Line Items]          
Net cash paid at acquisition $ 10,000,000        
Goodwill 1,200,000        
Business acquisition, Inventory acquired 200,000        
Business acquisition, equipment acquired 2,300,000        
Product Line | Technology-Based Intangible Assets          
Business Acquisition [Line Items]          
Intangible assets $ 6,300,000