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Components of Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Jun. 30, 2017
Line Of Credit Facility [Line Items]    
Total debt, Gross $ 511,659  
Total debt 450,992 $ 342,022
Current portion of long-term debt (20,000) (20,000)
Long-term debt, less current portion 430,992 322,022
0.25% Convertible Senior Note Due 2022    
Line Of Credit Facility [Line Items]    
Total debt, Gross 345,000  
Convertible senior notes unamortized discount attributable to cash conversion option and debt issuance costs including initial purchaser discount (59,450)  
Note payable    
Line Of Credit Facility [Line Items]    
Total debt, Gross 3,834  
Integrated Photonics, Inc | Note payable    
Line Of Credit Facility [Line Items]    
Total debt, Gross 3,834 3,834
Line of credit    
Line Of Credit Facility [Line Items]    
Total debt, Gross 90,000 252,000
Term Loans    
Line Of Credit Facility [Line Items]    
Total debt, Gross 70,000 85,000
Yen denominated line of credit    
Line Of Credit Facility [Line Items]    
Total debt, Gross 2,825 2,679
Credit Facility    
Line Of Credit Facility [Line Items]    
Credit facility unamortized debt issuance costs $ (1,217) $ (1,491)