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Debt - Components of Debt (Detail) - USD ($)
$ in Thousands
 6 Months Ended 9 Months Ended
Dec. 31, 2020
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Line of Credit Facility [Line Items]        
Total debt   $ 1,385,452 $ 2,255,342  
Current portion of long-term debt   (62,050) (69,250)  
Long-term debt, less current portion   $ 1,323,402 2,186,092  
0.50% Convertible Senior Notes        
Line of Credit Facility [Line Items]        
Debt instrument, interest rate   0.50%    
Total debt, gross   $ 14,900    
0.50% Convertible Senior Notes | Finisar Corporation        
Line of Credit Facility [Line Items]        
Total debt, gross   $ 14,888 14,888  
0.25% Convertible Senior Notes due 2022        
Line of Credit Facility [Line Items]        
Debt instrument, interest rate   0.25%   0.25%
Total debt, gross   $ 344,988 345,000  
0.25% convertible senior notes unamortized discount attributable to cash conversion option and debt issuance costs including initial purchaser discount   (20,425) (30,688)  
Term A Loan Facility        
Line of Credit Facility [Line Items]        
Total debt, gross   $ 1,072,925 1,194,463  
Term A Loan Facility | LIBOR        
Line of Credit Facility [Line Items]        
Debt instrument, rate added on variable rate   1.375%    
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Total debt, gross   $ 0 74,000  
Revolving Credit Facility | LIBOR        
Line of Credit Facility [Line Items]        
Debt instrument, rate added on variable rate   1.375%    
Term A Facility and Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Credit facility unamortized debt issuance costs   $ (26,924) (32,174)  
Term B Loan Facility        
Line of Credit Facility [Line Items]        
Total debt, gross   0 714,600  
Credit facility unamortized debt issuance costs   $ 0 $ (24,747)  
Term B Loan Facility | LIBOR        
Line of Credit Facility [Line Items]        
Debt instrument, rate added on variable rate 3.50%