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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Nov. 15, 2017
May 31, 2019
Jun. 29, 2019
Jun. 30, 2018
Jul. 01, 2017
Jul. 02, 2017
Jul. 03, 2016
Stock-Based Compensation              
Shares of common stock available for grant (in shares)     10,900,000        
Stock-based compensation capitalized to inventory     $ 1.0        
Closing stock price of company (in dollars per share)     $ 13.29        
Number of exercisable in-the-money options (in shares)     900,000        
Cumulative adjustment from adoption of ASU 2016-09 (Topic 718)           $ 0.0 $ (23.8)
Operating loss carryforwards       $ 117.7      
Stock option grants issued (in shares)     0 0 0    
Minimum remaining maturity period of traded options of the entity's common stock upon which implied volatility is based     6 months        
2003 Plan              
Stock-Based Compensation              
Common stock added to the pool of shares reserved for issuance under the plan (in shares) 4,000,000            
Number of shares authorized (in shares) 5,500,000            
Stock options and Full Value Awards issued and outstanding (in shares)     7,900,000        
1998 Purchase Plan              
Stock-Based Compensation              
Shares of common stock available for grant (in shares)     3,400,000        
Discount rate provided under purchase plan   15.00% 5.00%        
Look-back period     6 months        
Options              
Stock-Based Compensation              
Total intrinsic value of awards exercised (in dollars)     $ 0.2        
Unrecognized stock-based compensation     $ 0.4        
Estimated amortization period     7 months 6 days        
Employee Stock Purchase Plan              
Stock-Based Compensation              
Unrecognized stock-based compensation     $ 0.1        
Full Value Awards              
Stock-Based Compensation              
Unrecognized stock-based compensation     $ 49.3        
Estimated amortization period     1 year 8 months 12 days        
Minimum | Options              
Stock-Based Compensation              
Vesting period     3 years        
Stock awards expiration period     5 years        
Minimum | Full Value Awards              
Stock-Based Compensation              
Vesting period     1 year        
Maximum | Options              
Stock-Based Compensation              
Vesting period     4 years        
Stock awards expiration period     10 years        
Maximum | Full Value Awards              
Stock-Based Compensation              
Vesting period     4 years        
Accumulated Deficit              
Stock-Based Compensation              
Cumulative adjustment from adoption of ASU 2016-09 (Topic 718)       $ 0.6   $ 0.6 $ (24.0)