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Components of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Line Of Credit Facility [Line Items]    
Total debt, Gross $ 531,555  
Total debt 480,457 $ 439,013
Current portion of long-term debt (20,000) (20,000)
Long-term debt, less current portion 460,457 419,013
0.25% Convertible Senior Note Due 2022    
Line Of Credit Facility [Line Items]    
Total debt, Gross 345,000 345,000
Convertible senior notes unamortized discount attributable to cash conversion option and debt issuance costs including initial purchaser discount (50,155) (56,409)
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 125,000 80,000
Term Loans    
Line Of Credit Facility [Line Items]    
Total debt, Gross 55,000 65,000
Yen denominated line of credit    
Line Of Credit Facility [Line Items]    
Total debt, Gross 2,721 2,714
Credit Facility    
Line Of Credit Facility [Line Items]    
Credit facility unamortized debt issuance costs $ (943) $ (1,126)