Basis of Preparation and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Jul. 01, 2017 USD ($) customer Contract	Jul. 02, 2016 USD ($) customer Contract	Jun. 27, 2015 USD ($)	Sep. 30, 2017 USD ($)	Jun. 28, 2014 USD ($)
Business and Summary of Significant Accounting Policies [Line Items]
Cash and short term investments	$ 257,500,000
Cash and cash equivalents	219,270,000	$ 95,929,000	$ 111,840,000		$ 98,973,000
Restricted cash	716,000	715,000
Short-term investments	37,559,000	$ 0
Working capital	$ 388,600,000
Operating cycle	52/53 week year ending on the Saturday closest to June 30
Fiscal year period	365 days	365 days	365 days
Other non-current assets	$ 2,573,000	$ 2,237,000
Allowances for doubtful accounts	0	0	$ 100,000
Capitalized computer software costs	9,400,000	0
Depreciation expense on property and equipment	20,800,000	15,800,000	17,500,000
Loss on foreign currency transactions	$ 3,652,000	$ 2,362,000	2,144,000
Number of foreign currency forward exchange contracts | Contract	0	0
Foreign Currency Forward Exchange
Business and Summary of Significant Accounting Policies [Line Items]
Loss on foreign currency transactions	$ 500,000	$ 300,000
Customer Contracts
Business and Summary of Significant Accounting Policies [Line Items]
Estimated useful life of acquired tangible assets	15 years
Opnext
Business and Summary of Significant Accounting Policies [Line Items]
Assets under capital lease	$ 3,700,000	$ 5,900,000
Minimum
Business and Summary of Significant Accounting Policies [Line Items]
Estimated useful of assets	3 years
Estimated useful life of acquired tangible assets	1 year
Products warranty period from date of sale	12 months
Minimum | Stock Options
Business and Summary of Significant Accounting Policies [Line Items]
Award expected term	7 years
Award vesting period	2 years
Minimum | Restricted Stock Awards
Business and Summary of Significant Accounting Policies [Line Items]
Award vesting period	1 year
Maximum
Business and Summary of Significant Accounting Policies [Line Items]
Estimated useful of assets	7 years
Estimated useful life of acquired tangible assets	11 years
Products warranty period from date of sale	36 months
Maximum | Stock Options
Business and Summary of Significant Accounting Policies [Line Items]
Award expected term	10 years
Award vesting period	4 years
Maximum | Restricted Stock Awards
Business and Summary of Significant Accounting Policies [Line Items]
Award vesting period	4 years
China | Xi'an Raysung Photonics Inc.
Business and Summary of Significant Accounting Policies [Line Items]
Restricted cash	$ 1,100,000
Other non-current assets	400,000
Foreign Subsidiaries
Business and Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 69,900,000
Cost of Goods Sold
Business and Summary of Significant Accounting Policies [Line Items]
Impairment of goodwill, other intangible assets and long-lived assets			$ 2,000,000
Customer Concentration Risk | Accounts Receivable
Business and Summary of Significant Accounting Policies [Line Items]
Number of major customers | customer	1	4
Percentage of gross accounts receivable		63.00%
Forecast | Additional Paid-In Capital
Business and Summary of Significant Accounting Policies [Line Items]
Cumulative effect of new accounting principle in period of adoption				$ (300,000)
Forecast | Accumulated Deficit
Business and Summary of Significant Accounting Policies [Line Items]
Cumulative effect of new accounting principle in period of adoption				$ 300,000
Customer A | Customer Concentration Risk | Accounts Receivable
Business and Summary of Significant Accounting Policies [Line Items]
Percentage of accounts receivable	20.00%	23.00%