Other Intangible Assets - Additional Information (Detail) - USD ($)		12 Months Ended
	Jul. 23, 2012	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016	Oct. 27, 2014
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net		$ 61,000	$ 699,000
Amortization expected in fiscal year 2019		100,000
Amortization of other intangible assets		653,000	786,000	$ 995,000
Impairment of other intangible assets		$ 0	$ 0	$ 0
Opnext
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets acquired	$ 16,400,000
Komoro
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets transferred					$ 4,400,000
Minimum | Opnext
Goodwill And Other Intangible Assets [Line Items]
Estimated useful life of acquired tangible assets	1 year
Maximum | Opnext
Goodwill And Other Intangible Assets [Line Items]
Estimated useful life of acquired tangible assets	11 years