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Basis of Presentation - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jul. 02, 2016 | May 29, 2018 | Mar. 22, 2017 | Mar. 03, 2017 | Aug. 21, 2013
Property, Plant and Equipment |  |  |  |  |  |  |
Restricted cash | $ 7.3 | $ 11.2 |  |  |  |  |
Advertising cost during the period | 2.6 | 2.1 | $ 2.6 |  |  |  |
Asset retirement obligations included in other current liabilities | 0.7 | 0.3 |  |  |  |  |
Asset retirement obligations included in other non-current liabilities | $ 3.0 | $ 3.3 |  |  |  |  |
Customer A - OSP customer | Customer Concentration Risk | Accounts receivable, net |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Concentration risk percentage, more than | 10.00% |  |  |  |  |  |
Building and improvements | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 10 years |  |  |  |  |  |
Building and improvements | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 50 years |  |  |  |  |  |
Machinery and equipment | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 2 years |  |  |  |  |  |
Machinery and equipment | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 20 years |  |  |  |  |  |
Furniture, fixtures, software and office equipment | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 2 years |  |  |  |  |  |
Furniture, fixtures, software and office equipment | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 5 years |  |  |  |  |  |
Software | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 2 years |  |  |  |  |  |
Software | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 5 years |  |  |  |  |  |
Office equipment | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 2 years |  |  |  |  |  |
Office equipment | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 5 years |  |  |  |  |  |
Demonstration units | Minimum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 3 years |  |  |  |  |  |
Demonstration units | Maximum |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Estimated useful lives | 5 years |  |  |  |  |  |
Convertible Debt | 0.625% Senior Convertible Notes |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Interest rate on senior convertible notes | 0.625% |  |  |  |  |  | 0.625%
Convertible Debt | 1.75% Senior Convertible Notes |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Interest rate on senior convertible notes | 1.75% |  |  | 1.75% |  |  |
Convertible Debt | 1.00% Senior Convertible Notes |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |
Interest rate on senior convertible notes | 1.00% |  |  |  | 1.00% | 1.00% |

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