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Components of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Line Of Credit Facility [Line Items]    
Total debt, Gross $ 471,501  
Total debt 404,742 $ 342,022
Current portion of long-term debt (20,000) (20,000)
Long-term debt, less current portion 384,742 322,022
0.25% Convertible Senior Notes 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 (65,359)  
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 40,000 252,000
Term Loans    
Line Of Credit Facility [Line Items]    
Total debt, Gross 80,000 85,000
Yen denominated line of credit    
Line Of Credit Facility [Line Items]    
Total debt, Gross 2,667 2,679
Credit Facility    
Line Of Credit Facility [Line Items]    
Credit facility unamortized debt issuance costs $ (1,400) $ (1,491)