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Stock-Based Compensation - Additional Information (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Nov. 15, 2017
shares
Jun. 30, 2018
USD ($)
executive
$ / shares
shares
Jul. 01, 2017
USD ($)
Aug. 01, 2015
USD ($)
Stock-Based Compensation        
Shares of common stock available for grant (in shares) | shares   14,800,000    
Stock-based compensation capitalized to inventory   $ 0.8    
Total incremental stock-based compensation expense       $ 13.6
Extended exercise period for fully exercisable options resulted from modification   2 years    
Number of executives impacted by plan modification (in executive) | executive   6    
Incremental stock-based compensation cost   $ 6.3    
Closing stock price of company (in dollars per share) | $ / shares   $ 10.24    
Number of exercisable in-the-money options (in shares) | shares   600,000    
Cumulative adjustment from adoption of ASU 2016-09 (Topic 718)     $ 0.0  
Operating loss carryforwards     117.7  
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) | shares 4,000,000      
Number of shares authorized (in shares) | shares 5,500,000      
Stock options and Full Value Awards issued and outstanding (in shares) | shares   7,700,000    
1998 Purchase Plan        
Stock-Based Compensation        
Shares of common stock available for grant (in shares) | shares   4,300,000    
Discount rate provided under purchase plan   5.00%    
Look-back period   6 months    
Options        
Stock-Based Compensation        
Total intrinsic value of awards exercised (in dollars)   $ 1.2    
Unrecognized stock-based compensation   $ 1.0    
Estimated amortization period   1 year 7 months 2 days    
Employee Stock Purchase Plan        
Stock-Based Compensation        
Unrecognized stock-based compensation   $ 0.1    
Full Value Awards        
Stock-Based Compensation        
Unrecognized stock-based compensation   $ 38.5    
Estimated amortization period   1 year 8 months 2 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