Components of Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Line Of Credit Facility [Line Items]
Total debt	$ 2,377,646	$ 466,997
Current portion of long-term debt	(45,034)	(23,834)
Long-term debt, less current portion	2,332,612	443,163
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	(40,605)	(43,859)
Integrated Photonics, Inc | Note payable
Line Of Credit Facility [Line Items]
Total debt, Gross	3,834	3,834
Finisar Corporation | 0.50% convertible senior notes
Line Of Credit Facility [Line Items]
Total debt, Gross	575,000
Term A Loan Facility
Line Of Credit Facility [Line Items]
Total debt, Gross	680,000
Line of credit
Line Of Credit Facility [Line Items]
Total debt, Gross		115,000
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Total debt, Gross	160,000
Term Loans
Line Of Credit Facility [Line Items]
Total debt, Gross		45,000
Term A Facility and Revolving Credit Facility
Line Of Credit Facility [Line Items]
Credit facility unamortized debt issuance costs	(37,358)
Yen denominated line of credit
Line Of Credit Facility [Line Items]
Total debt, Gross		2,783
Term B Loan Facility
Line Of Credit Facility [Line Items]
Total debt, Gross	720,000
Credit facility unamortized debt issuance costs	$ (28,225)
Credit Facility
Line Of Credit Facility [Line Items]
Credit facility unamortized debt issuance costs		$ (761)