Debt - Components of Debt (Detail) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2020	Sep. 24, 2019	Jun. 30, 2019	Mar. 31, 2019
Line of Credit Facility [Line Items]
Total debt	$ 2,282,425		$ 466,997
Current portion of long-term debt	(69,250)		(23,834)
Long-term debt, less current portion	2,213,175		443,163
Integrated Photonics, Inc | Note payable
Line of Credit Facility [Line Items]
Total debt, Gross	$ 0		3,834
0.50% Convertible Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, interest rate	0.50%	0.50%
0.50% Convertible Senior Notes | Finisar Corporation
Line of Credit Facility [Line Items]
Total debt, Gross	$ 14,888		0
0.25% Convertible Senior Note Due 2022
Line of Credit Facility [Line Items]
Debt instrument, interest rate	0.25%			0.25%
Total debt, Gross	$ 345,000		345,000
0.25% convertible senior notes unamortized discount attributable to cash conversion option and debt issuance costs including initial purchaser discount	(34,019)		(43,859)
Term A Loan Facility
Line of Credit Facility [Line Items]
Total debt, Gross	$ 1,209,975		0
Term A Loan Facility | 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]
Total debt, Gross	$ 90,000		0
Revolving Credit Facility | 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]
Credit facility unamortized debt issuance costs	$ (33,928)		0
Term B Loan Facility
Line of Credit Facility [Line Items]
Total debt, Gross	716,400		0
Credit facility unamortized debt issuance costs	$ (25,892)		0
Term B Loan Facility | LIBOR
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	3.50%
Term Loans
Line of Credit Facility [Line Items]
Total debt, Gross	$ 0		45,000
Term Loans | 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]
Total debt, Gross	$ 0		115,000
Line of credit | LIBOR
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	1.75%
Credit Facility
Line of Credit Facility [Line Items]
Credit facility unamortized debt issuance costs	$ 0		(761)
Yen denominated line of credit
Line of Credit Facility [Line Items]
Total debt, Gross	$ 0		$ 2,783
Yen denominated line of credit | LIBOR
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	1.75%