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Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 23, 2019
USD ($)
Sep. 24, 2019
USD ($)
Aug. 31, 2017
USD ($)
d
$ / shares
Dec. 31, 2020
USD ($)
d
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
d
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Line of Credit Facility [Line Items]                
Cash paid for interest           $ 13,898,000 $ 24,745,000  
Available credit under lines of credit       $ 448,600,000 $ 448,600,000 $ 448,600,000    
Weighted average interest rate of total borrowings       1.70% 1.70% 1.70% 3.80%  
0.25% Convertible Senior Notes due 2022                
Line of Credit Facility [Line Items]                
Debt instrument, interest rate       0.25% 0.25% 0.25% 0.25%  
Aggregate principal amount     $ 345,000,000          
Aggregate principal outstanding       $ 345,000,000 $ 345,000,000 $ 345,000,000   $ 345,000,000
Debt instrument, conversion ratio     0.02125          
Debt instrument conversion, conversion price per share (in usd per share) | $ / shares     $ 47.06          
Debt instrument conversion, If-converted value of notes           $ 556,900,000   $ 346,200,000
Debt instrument conversion, trading days | d     20 20        
Debt instrument conversion, consecutive trading days | d     30 30        
Debt instrument conversion, conversion price percentage     130.00% 130.00%        
Debt instrument conversion, business day period     5 days          
Debt instrument conversion, measurement period     5 days          
Debt instrument conversion, measurement period percentage     98.00%          
Effective interest rate       4.50% 4.50% 4.50%   4.50%
Unamortized discount amount       $ 20,800,000 $ 20,800,000 $ 20,800,000    
Amortization period           3 years    
0.50% Finisar Convertible Notes                
Line of Credit Facility [Line Items]                
Redemption price percentage   100.00%       100.00%    
Debt instrument, interest rate       0.50% 0.50% 0.50%    
Aggregate principal amount   $ 560,100,000            
Debt instrument, repurchase amount $ 561,100,000              
Aggregate principal outstanding       $ 14,900,000 $ 14,900,000 $ 14,900,000    
Bank of America, N.A.                
Line of Credit Facility [Line Items]                
Letter of credit sub-facility maximum borrowing capacity       25,000,000.0 25,000,000.0 25,000,000.0    
Swing loan sub-facility maximum initial borrowing capacity       20,000,000.0 20,000,000.0 20,000,000.0    
Senior Secured Credit Facility | Bank of America, N.A.                
Line of Credit Facility [Line Items]                
Aggregate principal amount       2,425,000,000 2,425,000,000 2,425,000,000    
Term A Loan Facility                
Line of Credit Facility [Line Items]                
Proceeds from term loan $ 561,000,000.0              
Aggregate principal outstanding       1,163,438,000 1,163,438,000 1,163,438,000   $ 1,194,463,000
Term A Loan Facility | Bank of America, N.A.                
Line of Credit Facility [Line Items]                
Aggregate principal amount       1,255,000,000 1,255,000,000 $ 1,255,000,000    
Debt agreement term           5 years    
Redemption price percentage           1.25%    
Term B Loan Facility                
Line of Credit Facility [Line Items]                
Aggregate principal amount       720,000,000 720,000,000 $ 720,000,000    
Debt agreement term           7 years    
Cash paid for interest           $ 600,000    
Debt issuance costs         24,700,000      
Aggregate principal outstanding       0 0 0   714,600,000
Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Aggregate principal outstanding       0 0 0   $ 74,000,000
Revolving Credit Facility | Bank of America, N.A.                
Line of Credit Facility [Line Items]                
Aggregate principal amount       $ 450,000,000 $ 450,000,000 $ 450,000,000    
Debt agreement term           5 years    
Senior Credit Facilities | Fifth Fiscal Quarter Through Eighth Fiscal Quarter After Closing Date                
Line of Credit Facility [Line Items]                
Leverage ratio           4.50    
Senior Credit Facilities | Subsequent Fiscal Quarter                
Line of Credit Facility [Line Items]                
Leverage ratio           4.00    
Senior Credit Facilities | Minimum                
Line of Credit Facility [Line Items]                
Interest coverage ratio           3.00    
Senior Credit Facilities | Maximum | First Four Fiscal Quarters After Closing Date                
Line of Credit Facility [Line Items]                
Leverage ratio           5.00    
Senior Credit Facilities | Federal Funds Rate                
Line of Credit Facility [Line Items]                
Debt instrument, rate added on variable rate           0.50%    
Senior Credit Facilities | Eurodollar                
Line of Credit Facility [Line Items]                
Debt instrument, rate added on variable rate           1.00%    
Senior Credit Facilities | 0.25% Convertible Senior Notes due 2022 | I I V I Notes                
Line of Credit Facility [Line Items]                
Number of days prior to maturity of outstanding | d           120    
Debt instrument, interest rate       0.25% 0.25% 0.25%