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Fair Value of Financial Instruments - Summary of Fair Value and Carrying Value of II-VI Notes and Finisar Notes (Detail)
$ in Thousands
Mar. 31, 2021
USD ($)
0.25% Convertible Senior Notes due 2022  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Convertible notes fair value $ 519,918
Convertible notes carrying value 324,563
Finisar Notes  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Convertible notes fair value 14,739
Convertible notes carrying value $ 14,888