Debt - Components of Debt (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Aug. 31, 2017
Line of Credit Facility [Line Items]
Debt, gross	$ 2,342,951,000
Total debt	2,255,342,000	$ 466,997,000
Current portion of long-term debt	(69,250,000)	(23,834,000)
Long-term debt, less current portion	2,186,092,000	443,163,000
Integrated Photonics, Inc | Note payable
Line of Credit Facility [Line Items]
Debt, gross	$ 0	3,834,000
0.50% Convertible Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, interest rate	0.50%
0.50% Convertible Senior Notes | Finisar Corporation
Line of Credit Facility [Line Items]
Debt, gross	$ 14,888,000	0
0.25% Convertible Senior Note Due 2022
Line of Credit Facility [Line Items]
Debt instrument, interest rate	0.25%		0.25%
Debt, gross		345,000,000		$ 345,000,000
Convertible senior notes unamortized discount attributable to cash conversion option and debt issuance costs including initial purchaser discount	$ (30,688,000)	(43,859,000)
Term A Loan Facility
Line of Credit Facility [Line Items]
Debt, gross	$ 1,194,463,000	0
Term A Loan Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	2.00%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt, gross	$ 74,000,000	0
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	2.00%
Term A Facility and Revolving Credit Facility
Line of Credit Facility [Line Items]
Amended credit facility unamortized debt issuance costs	$ (32,174,000)	0
Term B Loan Facility
Line of Credit Facility [Line Items]
Debt, gross	714,600,000	0
Amended credit facility unamortized debt issuance costs	$ (24,747,000)	0
Term B Loan Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	3.50%
Term Loans
Line of Credit Facility [Line Items]
Debt, gross	$ 0	$ 45,000,000
Term Loans | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		1.75%
Line of credit
Line of Credit Facility [Line Items]
Debt, gross	0	$ 115,000,000
Line of credit | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		1.75%
Credit Facility
Line of Credit Facility [Line Items]
Amended credit facility unamortized debt issuance costs	0	$ (761,000)
Yen denominated line of credit
Line of Credit Facility [Line Items]
Debt, gross	$ 0	$ 2,783,000
Yen denominated line of credit | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		1.75%