Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Jul. 01, 2019
Schedule Of Lease Assets And Liabilities [Line Items]
Revenue practical expedient	true
Revenue practical expedient description	The Company elected the practical expedient package permitted under the transition approach. As such, the Company did not reassess whether any expired or existing contracts are or contain leases, did not reassess historical lease classification, and did not reassess initial direct costs for any leases that existed prior to July 1, 2019.
Operating lease assets		$ 80,100
Operating lease liabilities	$ 128,092	$ 80,100
Finance lease assets	$ 25,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Finance lease liabilities	$ 24,231
Payments for operating leases	5,900
Finisar Corporation
Schedule Of Lease Assets And Liabilities [Line Items]
Operating lease assets	45,000
Operating lease liabilities	$ 48,000